Good catch on the bolt stop mount. I wouldn't have noticed, having never dealt with a receiver sight mounted in that manner on a Mauser. I am somewhat ashamed on not seeing the phillips heads on the buttplate, but I was so thrilled that it was in such good shape for it's approximate age that I missed the obvious.
As for the stock, yes, the over-rounding on the receiver panels is unfortunate. The refinisher did not round over the forearm outer edge around the barrel channel nor where the receiver sits, and did sensitive work where the wrist meets the comb.
I do wonder if the receiver panels could be reduced in height by a few thousandths to restore the crisp edges. If I bought it, I'd be on the phone to some restoration folks about that as soon as I knew it was safe to shoot.
(The good thing is that it likely will keep the price to an approachable level.)
All in all I was gobsmacked by the shaping work on the barrel and sight rib. If I get another turn around the wheel I should like to become that sort of metalsmith.
Thank you for the link; I think I need to pick up some appropriate literature on the subject of these rifles. And (with your blessing), I want your last comment as a signature line.
Based on the custom Commission rifle in the magazine article, a Gunbroker search turned up this decently engraved Haenel example:
https://www.gunbroker.com/item/991734175