After stripping the paint off of the Green Mosin, while finishing the stock, I found this handwritten serial number
Looks like the pencil took up some green dye from the paint job
This marking is consistent with "Russian Replacement Stocks" per 7.62x54R.net, and since this is a 'Force Match' , this would make sense.
The wood is quite beautiful, so this stock will remain un-modded.
But that is OK, I have others!