P-F Self-Winding Watch 30 Day Challenge

[RJ]

Many of y'all have Automatic or Self-Winding watches, but how accurate are they? Can your watch pass the COSC standard Mean Daily Rate of -4s/+6s to be certified as a Chronometer? :cool:

http://www.chronocentric.com/watches/accuracy.shtml

If so, take the 30 Day Challenge, and we'll see who has the most accurate watch. :cool:

P-F Self-Winding Watch 30 Day Challenge

- To enter the Challenge, on or before January 1st, set your watch to a known time standard (NIST, 3WV, GPS, NTP server, etc.)
- Post when you start the challenge, and any other pertinent details, such as the time standard you selected.
- Wear your watch as normal (wrist, watch winder, or combination) for 30 days.
- On or after 2/1/2018, post your achieved Mean Daily Rate (i.e. actual seconds gained or lost, divided by 30 days)

The first week in February, I'll compile a list of the most accurate watches. It's ok to enter the challenge with less than 30 days, but lets try and keep it to a meaningful time period (14 day min?) so that the true accuracy of the watch without adjustment can be observed. All measurements are on your honor. For purposes of this thread, let's keep it to Automatic Watches only:

https://en.wikipedia.org/wiki/Automatic_watch

And although you may have more than one, let's use the one you have the most faith in as far as accuracy.

May the most accurate watch win!

More Background Information

I've been fascinated with time ever since I first read of the work of John Harrison and his H4 Chronometer. John spent 31 years figuring out how to build a Clock accurate enough to solve the Longitude Problem and win a prize worth $4M in today's money in 1761.

Back in the day, knowing local noon could determine your longitude (East/West). A watch accurate to 1 minute of time translated into about a mile's error; pretty significant if you were looking for an Island in the ocean.

Being a bit of a dinosaur, I've always worn a mechanical self-winding watch, and have appreciated them for the engineering involved in maintaining time accuracy in today's digital world.

http://www.chronocentric.com/watches/accuracy.shtml
http://www.longitudestore.com/how-big-is-one-gps-degree.html

[JodyH]

The "WatchCheck (https://play.google.com/store/apps/details?id=de.uhrenbastler.watchcheck&hl=en)" app for Android is a great way to test your watches accuracy over time.
I'll bust out my Rolex Milgauss for this challenge, the last time I timed it over a two month stretch it averaged -0.1 seconds per day.

Here's a screenshot of what my Air-King averaged over 2 months this summer +1.2 s/d:

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And here's it's latest run from December 10 up thru today +1.5 s/d:

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[JodyH]

And my official entry Rolex Milgauss.

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[Totem Polar]

I’d be up for the challenge, but I only have two auto/manuals right now: the manual is consistently -6 (very consistent) and the auto is consistently +6. Meaning, I’ve been too lazy to take them both in to get regulated. The manual is a 6498 ETA, and the auto is the glock-esque omnipresent ETA 2824, elabore and top grade, respectively. Both movements have been proven tunable to COSC in real-world wear. I had an Omega 2254.5 with their modification of the same movement that easily ran < +1.5 on the wrist for months at a time, once my guy got it dialed in for my level of axtivity and wear usage, and I’ve had 3 Sinns perform similarly. I’m sure if I were to commit to either watch just by regulating them, either one would fly through the 30 days.

[Hambo]

That reminds me that I should sell my Speedmaster. I haven't worn it in years and I'm sure it needs cleaned and regulated.

[JodyH]

A lot of the ETA's a very sensitive to low power reserve, my COSC DOXA runs dead on 0.0 s/d unless I don't wear it for 24 hours then it turns into speed racer.
Good news is ETA's are often also sensitive to positional variance so you can "tune" the watch to average very well.
If it runs +2 over 16 hours on the wrist and you find out that crown up overnight equals -2 seconds over 8 hours you average out to 0.0 seconds per day.
My Rolexes on the other hand, they are what they are no matter the power level and no matter the position. Very good for 24/7/365 consistency, bad for "tuning".

[Joe S]

I know my Vostok Amphibia won't make it, but I'm game to try my little Seiko 5.

A thought: if we're comparing data between models, should we establish usage parameters? I wear my watch 24/7, and the running/lifting/kettlebell probably has a noticeable effect that will skew it away from a watch not worn during those activities. Or does someone need to tell the lab scientist to relax a little?

Joe S.

[blues]

My Omega Seamaster would have been up to the challenge if it weren't so long overdue for a tune-up. One of these days. (Maybe.)

[JodyH]

I know my Vostok Amphibia won't make it, but I'm game to try my little Seiko 5.

A thought: if we're comparing data between models, should we establish usage parameters? I wear my watch 24/7, and the running/lifting/kettlebell probably has a noticeable effect that will skew it away from a watch not worn during those activities. Or does someone need to tell the lab scientist to relax a little?

Joe S.
If only the original post addressed your question.
Oh wait... it did!
:p


- Wear your watch as normal (wrist, watch winder, or combination) for 30 days.

[smithjd]

I’ve been wearing my Damasko DA-42 basically 24/7 since I bought it in February. I last hacked it on 1 December when I changed the date wheel. It is now +10 sec. I was planning to hack it at the end of February when I next have to change the date.

It has varied a bit over the past year, but averages about +1 sec per day wearing it all the time and not otherwise messing with it.

[Poconnor]

My Seiko SKX007 is very accurate if I wear it every day. I have a second 007 I bought used that will not keep accurate time even after being to to repair shop. Anybody use a winder to store their watch to keep it ready to go?

[blues]

My Seiko SKX007 is very accurate if I wear it every day. I have a second 007 I bought used that will not keep accurate time even after being to to repair shop. Anybody use a winder to store their watch to keep it ready to go?

I've had one for a few years that the missus bought me several years ago. (It only accommodates the one..but that's all I own.)

[Depmur]

https://uploads.tapatalk-cdn.com/20171229/6886c4ec2d2a700b73ab47363ac81fbc.jpg

I’m in.


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[RJ]

Anybody use a winder to store their watch to keep it ready to go?

I bought this one in 2016. It is kinda big, but it works. Both my and wife’s watch are stored in it when not being worn.

Top Quality Double Automatic Wood Watch Winder with 3 storages with reliable Japanese motor https://www.amazon.com/dp/B004BAAEZ6/ref=cm_sw_r_cp_api_jXOrAb1MTTSK6

[RJ]

I decided to start my thirty day run today: My entry is my Rolex Submariner, purchased new in 1993 at Lenkersdorfer Jewelers in Tyson’s Corner Mall in Fairfax County VA. I wear it daily, and store it in a Watch winder at night.

https://uploads.tapatalk-cdn.com/20171229/164f33f9382cf56ca877946bb46ef28c.jpg

(Yes it’s 14:00:01 but the 14:00:00 picture was fuzzy argh.)

Geez I just realized I’ve had it 24 years. It’s been serviced by Rolex four times over that period. My Bezel keeper retaining spring broke last year, and the Bezel fell off, so when the local Rolex guy replaced it, I asked him to regulate it.

It’s never been much better that +7 to 9s a day, really. But now after the guy worked on it it’s much more accurate than that. We’ll see how accurate. [emoji41]

My time standard is Atomic Watch Pro, a free iPhone app. For fun I’m going to also track my 4 year old beater Timex Ironman Watch. I use it going to WalMart.

[JSGlock34]

Since ToddG introduced me to Sinn, I'll enter my U1 - I just synchronized it for US Eastern Standard Time with the US Atomic clock widget at time.gov (https://time.gov/widget/widget.html). In the past it's been a +5/day watch for me.

These are old pics - I no longer have the VP9 or this particular G17 (though I have a GEN5 slide at ATEi as we speak), but I still have the watch...however, it is due for new pics since I recently swapped the bezel to a black SDR.

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[Odin Bravo One]

I wear a different watch most days of the week. My winders don’t accurately replicate proper movements to keep them accurate to that standard. But they are accurate enough for me. I’m simply not fascinated enough with it to dedicate the time. 22709

[JodyH]

Winders are like letting your car idle all night in the garage so you don't have to start it in the morning.

A lot of undue wear on parts so you can save a minute or two setting your watch if you haven't worn it in a few days.
Most of my watches have between 40 and 70 hours of power reserve, so even swapping around between two or three of them during the week I rarely have one run down.

[RJ]

Winders are like letting your car idle all night in the garage so you don't have to start it in the morning.

A lot of undue wear on parts so you can save a minute or two setting your watch if you haven't worn it in a few days.
Most of my watches have between 40 and 70 hours of power reserve, so even swapping around between two or three of them during the week I rarely have one run down.

My wife’s Rolex will literally stop in less than 24 hours if she does not wear it daily. I’ve been meaning to investigate it more with Rolex Service as it doesn’t sound right to me, but the winder has been pretty good for us. What do you think?

(After almost 25 years of 24/7 wearing on my wrist, including that time I wore it to 124’ on the deep dive to The Wall off Seven Mile Beach in Grand Cayman (at 4,000’ ish max depth if I dropped it, this was not one of my better ideas. :cool: ) I think mine will be ok. :) )

[JodyH]

My wife’s Rolex will literally stop in less than 24 hours if she does not wear it daily. I’ve been meaning to investigate it more with Rolex Service as it doesn’t sound right to me, but the winder has been pretty good for us. What do you think?

My wife's Rolex Oyster Perpetual 26mm will run down after around 40 hours.
It works out pretty good for her since she usually takes it off Friday evening and puts it back on Sunday mid-morning.
If she doesn't put it back on until Monday morning it'll need a wind.

Less than 24 is either she's not active enough to keep it fully wound or there's an issue.
The smaller rotor watches take more activity to keep a full wind in, so I'm guessing she's just not moving that wrist enough to keep it wound.
I'd fully hand wind it (40-50 or so full turns on the crown) then set it down horizontal, dial up (least friction position) and test the reserve from a full wind.

[Up1911Fan]

Just added the watch tracker app. I'll give this a go with my Omega AT 8500.

[Eurastus]

I received a nice new Omega Aqua Terra 8900 for Christmas. I’ve also got it set up in WatchTracker to run for the next month unadjusted. So far, it’s holding at +0.1 sec/day. Let’s hope it stays that way for the next 30 days!

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[Up1911Fan]

I received a nice new Omega Aqua Terra 8900 for Christmas. I’ve also got it set up in WatchTracker to run for the next month unadjusted. So far, it’s holding at +0.1 sec/day. Let’s hope it stays that way for the next 30 days!

22718

I love the new 8900 AT's, I'm going to get the grey/blue one sometime in 2018 to go with my 8500 "Skyfall" AT.

[GardoneVT]

Challenge Accepted.

There is one wrinkle for my entry; I’ll officially use my cheapest automatic ,an Invicta 8926 OB. I’m curious to see how a $100 automatic Seiko Movement stacks up in a field of $4,000+ offerings. I’ll be running my Khaki Pilot as a control also for the first 30 days of 2018.

I suppose it is appropriate to test timepieces in the first month of a new year,so let’s do this!

[98z28]

I'll play. I just synced my 10-year old Sinn 857 UTC to WatchCheck (Thanks JodyH!). It's been around +3 sec per day when worn. Not bad for a watch that has yet to be serviced.https://uploads.tapatalk-cdn.com/20180102/8d7fb746bf5f4556c8587be32680d2df.jpg

[Frank Ettin]

I'm in. I set my new Omega Co-Axial Moonphase Chronograph at about 0900 on the 1st. I plan to wear it all month.

[JodyH]

Milgauss is coming out of the gate strong.
Set it December 28th at 2:51PM and as of January 3rd at 6:00PM the daily average is +0.2 seconds per day per WatchCheck app.

[RJ]

Milgauss is coming out of the gate strong.
Set it December 28th at 2:51PM and as of January 3rd at 6:00PM the daily average is +0.2 seconds per day per WatchCheck app.

Damn, that’s impressive.

I just did a rough check of my Submariner after 6 days, I’m -3 for a -0.5s per day at the moment. This is pretty good for my watch over the years.

[GregB]

I'm in. Omega Speedmaster reduced, I bought it back in 93 or 94 and it's been in service ever since. I just had it serviced just before Summer.
I set the watch on the 31st using the US Naval Observatory Master Clock and am also using Watch Tracker.
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[JodyH]

Halfway point... Milgauss is -0.0 seconds per day average.
:cool:

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[Eurastus]

We’re now two weeks into this latest timing run and currently holding at +0.3 seconds per day on the new Omega Aqua Terra Master Chronometer (8900 movement).

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Here are more detailed recent data points:

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[RJ]

My interim results are:

Rolex is -8s (-0.50s per day)
Timex is +3s (+0.38s per day)

[Depmur]

I’m at +1SPD two weeks in.


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[JSGlock34]

And what this challenge has taught me is...that my watches are in need of regulation.

[GregB]

Average is +0.2 SPD.
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[JodyH]

Rolex Milgauss

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[98z28]

I screwed up and let the 857 wind down. A Speedy Reduced found me earlier this week (I wasn't looking for it!) and I couldn't resist wearing it for a couple days. I forgot to wind the Sinn and it had stopped when I went to put it back on this morning.

It was doing well up untill it stopped though. It averaged -2.6 seconds per day over the first 15 days of January. https://uploads.tapatalk-cdn.com/20180119/1eb7d8b6b8c822ef22a1be69e29eeb3a.jpg

[RJ]

I decided to start my thirty day run today: My entry is my Rolex Submariner, purchased new in 1993 at Lenkersdorfer Jewelers in Tyson’s Corner Mall in Fairfax County VA. I wear it daily, and store it in a Watch winder at night.

https://uploads.tapatalk-cdn.com/20171229/164f33f9382cf56ca877946bb46ef28c.jpg

(Yes it’s 14:00:01 but the 14:00:00 picture was fuzzy argh.)

Geez I just realized I’ve had it 24 years. It’s been serviced by Rolex four times over that period. My Bezel keeper retaining spring broke last year, and the Bezel fell off, so when the local Rolex guy replaced it, I asked him to regulate it.

It’s never been much better that +7 to 9s a day, really. But now after the guy worked on it it’s much more accurate than that. We’ll see how accurate. [emoji41]

My time standard is Atomic Watch Pro, a free iPhone app. For fun I’m going to also track my 4 year old beater Timex Ironman Watch. I use it going to WalMart.

Whelp my 30 days are up.

My Rolex is -28s off my Atomic Clock app, so it computes our to -0.93spd average.

Which, if I was using my watch to navigate over a 30 day sea voyage near the equator in 1805, I would only miss an Island by about a 1/2 Mile. :cool:

I suspect I’m not going to be the winner here, but for a wristwatch that I have worn almost daily for almost a quarter century, less than a second a day is not bad.

[JodyH]

Rolex Milgauss checking in at +0.1 s/d
Over the 31 days it gained 1.9 seconds.

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[GregB]

Average +0.4 SPD. +6.9 Seconds over 31 days.23440

[Depmur]

That Milgauss is amazing. My Explorer is plus 2.4 seconds per day, not that bad considering I had the flu for about a week and missed several days of wearing the watch.

https://uploads.tapatalk-cdn.com/20180131/06307ffeab6caf38cdd02e394e31424b.jpg


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[jrm]

No fancy app but used atomic clock app to sync up and measure by. Tag Heuer Formula 1 Caliber 5 lost 77 second over 30 days. Average -2.566666. I checked daily for the first couple weeks and it was pretty much a second a day it lost. Not sure what happened in the last half or so of testing to bump the average up. I am guessing being over or under wound somehow. I manually wound it once or twice along the way when I skipped a day of wear.

[Eurastus]

After 31.8 days since the last manual time reset, my new Omega Aqua Terra Master Chronometer (8900 movement) is 0.9 seconds fast as of 07:30 this morning.

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That gives me an average time gain of 0.028 seconds per day over the past month, which is pretty good in my book.

However.....

In order to achieve this level of 'accuracy', I have to be rather particular as to how I wear the watch. I have it on my wrist 24/7....except for two nights a week, when I leave it on the nightstand while I sleep.

While wearing the watch, it tends to gain an average of 0.3 seconds per day; sitting on the nightstand it loses about 1 second overnight.

So..... If I put the watch on the night-stand two nights a week, I know the watch is always between +0.5 seconds fast and -0.5 seconds slow.

I find that wearing an automatic, mechanical watch that is always within a half second of the atomic time standard is most satisfying to me.


But, if I forget to take it off overnight (like I should have done this past Sunday), it will creep faster than my upper limit of +0.5 seconds fast!

That's my own fault.

I've simply got to get in the habit of sleeping watch-less on Wednesday and Sunday nights.

[Frank Ettin]

Over the last 30 days my Omega Speedmaster Moonphase Master Chronometer Co-Axial Chronograph (ref. 304.33.44.52.03.001) gained a total of 54.8 seconds for an average daily deviation of +1.827 seconds. That's comfortably within the COSC standard of +6/-4.

During the last month I did nothing special. I take it off and put it on the nightstand at night, and wear it all day doing whatever I'm doing. It is new (a little Christmas present to myself) so it might change as it runs in.

I have a number of watches and tend to switch among them as the spirit moves me. But this will probably be my regular daily worn watch. I like the moonphase.



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[Eurastus]

Over the last 30 days my Omega Speedmaster Moonphase Master Chronometer Co-Axial Chronograph (ref. 304.33.44.52.03.001) gained a total of 54.8 seconds for an average daily deviation of +1.827 seconds. That's comfortably within the COSC standard of +6/-4.

23458


That's a super-nice watch there, Frank. All the Master Chronometer Omegas are rated for METAS, which is even more stringent than COSC. METAS is 0 to +5 per day; they're guaranteed not to lose time. Pretty sweet!

[Frank Ettin]

Thank you. I have been enjoying it. And congratulations on your Omega Aqua Terra. That's another very handsome watch from Omega. I think they've been doing some very good things with their co-axial movements.

[smithjd]

I started this 12/01/17 when I reset the date wheel on my Damasko DA-42. As of today it is -2 seconds over 63 days. It had been up to +17 or so mid January, so it’s been loosing about a second / day for the past two weeks. I wear it 24/7. I will next hack at the end of February when the date needs changing again.

[Sal Picante]

Damn - we gotta do this again...

[RJ]

Damn - we gotta do this again...

Your wish is my command.


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[RJ]

Many of y'all have Automatic or Self-Winding watches, but how accurate are they? Can your watch pass the COSC standard Mean Daily Rate of -4s/+6s to be certified as a Chronometer? :cool:

http://www.chronocentric.com/watches/accuracy.shtml

If so, take the 30 Day Challenge, and we'll see who has the most accurate watch. :cool:

P-F Self-Winding Watch 30 Day Challenge

- To enter the Challenge, on or before January 1st, set your watch to a known time standard (NIST, 3WV, GPS, NTP server, etc.)
- Post when you start the challenge, and any other pertinent details, such as the time standard you selected.
- Wear your watch as normal (wrist, watch winder, or combination) for 30 days.
- On or after 2/1/2018, post your achieved Mean Daily Rate (i.e. actual seconds gained or lost, divided by 30 days)

The first week in February, I'll compile a list of the most accurate watches. It's ok to enter the challenge with less than 30 days, but lets try and keep it to a meaningful time period (14 day min?) so that the true accuracy of the watch without adjustment can be observed. All measurements are on your honor. For purposes of this thread, let's keep it to Automatic Watches only:

https://en.wikipedia.org/wiki/Automatic_watch

And although you may have more than one, let's use the one you have the most faith in as far as accuracy.

May the most accurate watch win!

More Background Information

I've been fascinated with time ever since I first read of the work of John Harrison and his H4 Chronometer. John spent 31 years figuring out how to build a Clock accurate enough to solve the Longitude Problem and win a prize worth $4M in today's money in 1761.

Back in the day, knowing local noon could determine your longitude (East/West). A watch accurate to 1 minute of time translated into about a mile's error; pretty significant if you were looking for an Island in the ocean.

Being a bit of a dinosaur, I've always worn a mechanical self-winding watch, and have appreciated them for the engineering involved in maintaining time accuracy in today's digital world.

http://www.chronocentric.com/watches/accuracy.shtml
http://www.longitudestore.com/how-big-is-one-gps-degree.html

Arrright lets do this again.

Same rules, start 1/1/19 for 30 days.


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[JodyH]

I'm in it again.
Back with my Milgauss for round two.
I "zeroed" it on 12/28/18 and as of 1/1/18 I'm showing to be +-0.0 seconds per day.
Last year it ended up +0.1 s/d for the 30 days.
:cool:

[RJ]

Just set my 21 year old Rolex Submariner to pool.ntp.org at 1900 local via an iPad clock app.

https://uploads.tapatalk-cdn.com/20190102/c06654b45a58130ab3e52120a9a1b58f.jpg

I’m hoping for anything less than -1.0spd by 2/1/19.

[Duke]

33788

[Sal Picante]

I set my Marathon SAR (automatic) to 6:15:00 PM 12/31/2018 according to time.gov.

Let's see...

[JSGlock34]

I'm in! Set my Omega Seasmaster 300M this evening.

https://pistol-forum.com/attachment.php?attachmentid=3108&d=1423794831

[Sigfan26]

In with a Hamilton “Jack Ryan”.
https://uploads.tapatalk-cdn.com/20190103/ef7529f865df11bcb84d3249f65bca90.jpg


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[Isaac]

Winders are like letting your car idle all night in the garage so you don't have to start it in the morning.

A lot of undue wear on parts so you can save a minute or two setting your watch if you haven't worn it in a few days.
Most of my watches have between 40 and 70 hours of power reserve, so even swapping around between two or three of them during the week I rarely have one run down.

That's my view on it too. I've owned one before, and IMO, it takes less time to wind and set a watch than get it in and out of the winder.
Love the Air King BTW.. I know it's a polarizing model, but I think it's one of the coolest models.

[Duke]

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[GardoneVT]

In.

NIST synchronized , Hamilton Khaki Pilot Day-Date “Interstellar”.
ETA 2824-2 , historical accuracy was -1.8 seconds per day.

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[RJ]

So I glanced at my watch this morning, and was interested to note that it was actually +2 seconds ahead of my time standard?!

Last year I saw a pretty consistent -1.0 spd average.

Due to being sick with the flu/cold and starting work I left it on the winder the last five days, and wore my Timex most all of the time.

It's the first time it has occurred to me that positional variations can/do affect time accuracy in mechanical watches. To be honest I just wear my watch and over the last 20 years haven't really ever considered how it runs as affected by whether it's on me or not.

For those much more experienced than me in this, do mechanical watches generally gain time when on winders? Or is it watch dependant as to whether the mechanical position of the watch when it it not worn affects the timekeeping?

Thoughts?

[GardoneVT]

So I glanced at my watch this morning, and was interested to note that it was actually +2 seconds ahead of my time standard?!

Last year I saw a pretty consistent -1.0 spd average.

Due to being sick with the flu/cold and starting work I left it on the winder the last five days, and wore my Timex most all of the time.

It's the first time it has occurred to me that positional variations can/do affect time accuracy in mechanical watches. To be honest I just wear my watch and over the last 20 years haven't really ever considered how it runs as affected by whether it's on me or not.

For those much more experienced than me in this, do mechanical watches generally gain time when on winders? Or is it watch dependant as to whether the mechanical position of the watch when it it not worn affects the timekeeping?

Thoughts?

Mechanical timepieces do run differently depending on position. The intent behind the Tourbillon complication was to eliminate position based inaccuracy for pocketwatches, versus its modern purpose of justifying higher prices.

Each watch has a “sweet spot” which maintains accurate time best in a given unworn position.

This information is brought to you by my occasionally unhealthy interest in horology.

[JodyH]

For those much more experienced than me in this, do mechanical watches generally gain time when on winders? Or is it watch dependant as to whether the mechanical position of the watch when it it not worn affects the timekeeping?

Thoughts?
Every watch is different but the following usually holds true:
Dial up or down (watch flat) will tend to run fast or maintain due to less friction on the drivetrain.
Dial vertical (12, 3, 6, 9 up) will tend to run slow due to gravity causing friction on the drivetrain.
On a winder tends to speed things up or down depending on the watch. Due to voodoo?
Low power reserve tends to speed things up (the spring controls the oscillations, less control usually equals shorter time between the "tick" and the "tock").

[That Guy]

however, it is due for new pics since I recently swapped the bezel to a black SDR.

Wait, what? You can swap bezels on those watches? Is that a DIY thing, or does it require specialized tools, knowledge, or skills?

(Sorry for the slight topic drift, but the U1 is my fantasy "one watch", and I'm simply fascinated with it.)

[JSGlock34]

Wait, what? You can swap bezels on those watches? Is that a DIY thing, or does it require specialized tools, knowledge, or skills?

It's a DIY procedure, using the micro screwdriver tool that comes with the U1 (and is also used for the bracelet adjustments). There are three small screws that retain the bezel. Honestly, the hardest part is making sure you don't accidentally lose one of the small screws...(yes, there was a close call involved). Also, spare U1 SDR bezels aren't easily sourced, and the price has steadily climbed. I watched the boards for a few months before coming across one.

34189

Here's a video on the procedure.


https://www.youtube.com/watch?v=FkhSRUuF_FA

And an updated photo...

34190

[Sal Picante]

I set my watch by time.gov (NIST) on the 31st, so my 30 days are up.

Marathon GSAR (US Gov model) - I've worn this watch for years, hardly take it off, just for jiujitsu and etc. It was last adjusted about year ago by Motor City Watch Works out of Detroit, MI.

I'm 2:29s slow, so 149/30 = 4.966.

We'll just round that to -5s.

For a watch that has been worn everywhere, non-stop, from FL to CA in the past month alone, that's not bad.

I'm planning a BALL GMT at some point. (I love the Rolex GMT2master, but think the BALL is a nicer functional watch - I like my night sight watches.)

[RJ]

Whelp I think I might be in with a chance this year.

Two days to go, near as dammit spot on 0.0 spd:

https://uploads.tapatalk-cdn.com/20190131/7a3303ca3f52f73963e832b4e235d696.jpg

Of course I have an asterisk*. :cool:

*I discovered, thanks to you guys, my watch gains about +1 spd on the winder. And I know from last year that I lose about -1 spd on my wrist...so...I just stick it on the winder every couple days lol. I find that amusing, especially for a 20 year+ old wristwatch.

How are y’alls watches holding out?


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[JodyH]

Me and my Milgauss dropped out sometime mid-month.
My Dad was in the hospital for a week for some pretty significant surgeries at a hospital 2 hours away so knowing I was going to be travelling in the dark both ways and sitting in a dimly lit room I wore my G-Shock so i could light it up, so the poor neglected Milgauss wound down in the safe.

Me and the Milgauss will be back in this next year!

[fwrun]

I know I am one day early, but here is my entry.

Seiko SKX007 set to NIST at 00:00 on 1/1/19.
(The movement is non-hacking, but I used the trick where you apply slight pressure in the reverse to stop the second hand)

Worn in wrist daily, placed on nightstand face up nightly.

At 03:18 on 1/31/19, I am at +12 seconds after 30 days, for an average of +.4 seconds per day.

This is a rare one, has been better than 1sec/day since I first received the watch. An absolute anomaly for this movement.

[Eurastus]

I last set the time on my Omega Aqua Terra (8900 movement) on 30 December 2017, so it’s been more than a year since I’ve even unscrewed the crown. I use the same trick Rich Jenkins does to ever so slightly adjust the time every couple of days. When on my wrist, I know the AT will lose almost exactly one second every 24 hours; if I set it crown-up on my nightstand, it will gain almost exactly one second every eight hours while I sleep overnight.

You can see from the attached graph of the month of January 2019 that I keep it within 1.5 seconds of true time without any trouble.

I’m very satisfied with the accuracy of this watch.

[98z28]

Man, we've got some well-regulated autos around here!

Official entry: Monta Skyquest with Sellita SW330 (ETA 2893 clone)

Set to GPS on January 1, 2019, observed with the WatchCheck Android app.

Average rate as of January 31, 2019: -0.9 seconds per day.

Maximum observed daily deviation: -1.5 seconds per day.

The watch was worn daily and placed on the nightstand dial up at night.


Just for fun, here's some other recent data on ETA-based movements (all observed over roughly 30-day periods and worn normally):

Monta Oceanking with Sellita SW300 (ETA 2892 clone): average daily rate +0.1 seconds per day, maximum daily deviation +/- 0.1 seconds per day. Not entered because it had to go back to Monta to replace the movement. The date wheel kept getting stuck. I hope the new one is even half as consistent.

Monta Triump with SW300 (ETA 2892 clone): average daily rate -2.4 seconds per day, maximum daily deviation -4.2 seconds per day.

Omega Speedmaster Automatic with Omega 3220 calibre, an ETA 2892 base with the Dubois-Debrois chronograph module: average daily rate -7.7 seconds per day, maximum daily deviation -9.2 seconds per day.

Sinn EZM 3F with ETA 2824-2: average daily rate -1.7 seconds per day, maximum daily deviation -3.3 seconds per day.

[GardoneVT]

Hamilton Khaki Pilot Day-Date. -0.4 Seconds Per Day, logged over ten days. It was COSC accurate out of the box two years back and it’s only gotten better since.

[JSGlock34]

My Omega Seamaster 300 ran a little hot, posting +3.5 avg. That's a bit fast for this watch in my experience, so I think I need to read a bit more about what others are doing in terms of overnight orientation. I tend to place the watch face down overnight which likely accounts for the gain.

[JSGlock34]

And what this challenge has taught me is...that my watches are in need of regulation.


My Omega Seamaster 300 ran a little hot, posting +3.5 avg. That's a bit fast for this watch in my experience, so I think I need to read a bit more about what others are doing in terms of overnight orientation. I tend to place the watch face down overnight which likely accounts for the gain.

So I recently discovered that both my Sinn U1 and my Omega Seamaster 300M had become magnetized. Both were presenting abnormally fast, and erratic, times (the Sinn especially). I used the Lepsi app to diagnose that they were in fact magnetized, and then I ordered one of these cheap demagnetizers from Amazon.

https://www.amazon.com/gp/product/B07H9YC4DJ/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1
(https://www.amazon.com/gp/product/B07H9YC4DJ/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1)

https://images-na.ssl-images-amazon.com/images/I/51smC3keaKL._SL1001_.jpg

The Seamaster is now running about +.3 day; the Sinn is clocking around +2 seconds.