That's a GECO mount pattern, I just need to update the page on my site. The stock is a replacement with random repairs. I can't tell for sure in the first picture, but it looks like it has pressed sling slot escutcheons. If so, then it's a post-war replacement stock and at least a decade removed from the action. If they are screwed escutcheons then it's from the same era as the rifle, but still probably not the original to that rifle. I don't know exactly what kind of relief the GECO mount would require, but it would be more like a PU than a PE top mount, which that one repair superficially resembles. However, for a PE top mount there would need to be a cut on both sides of the stock. The cut at the bolt is typical of all Mosin stocks, sniper or not. I certainly would not re-sniper it either as you'd probably never be able to get the correct GECO mount and whatever scope goes with it (out of my league on that). Congratulations.