It's a no lock Model 29, it will always be valuable, that value will stay at minimum stable as long as you don't beat the thing to death (i.e., wear all of the finish off it, drop it, let it rust, etc).
The flipside is, by virtue of being a 29- as opposed to a no-dash 29, means it will never be the most collectible gun. This means that you aren't going to wake up one morning and find your gun worth 10k (well it's unlikely, let's put it that way). So, even in mint condition the value is unlikely to rise significantly (percentage wise) over time.
I might be in the minority, but my expectation is that revolver prices (collector grade guns) will level out significantly over the next few years and may even drop some. They have already leveled off compared to where they were five years ago. I've been watching single action Colts for awhile now and have started to note a plateau of prices. Even the exceedingly rare guns or those with good stories and provenance aren't bringing what one might predict. The same is starting to occur with DA revolvers of all types.
Basically, my point is, your gun isn't likely to increase significantly in collector value in the near term and thus any value lost from shooting will likely be miniscule compared to the enjoyment you get from it.