Attachment 49955Attachment 49956
This is the location of the cartouche when the stock was proof fired and had the P stamp by the pistol grip. It can also be the location of a rebuild stamp (or two).
The photo shows a WW2 Winchester stock that was rebuilt during WW2 and had the SA GAW stamp applied as a rebuild stamp, also a second P proof stamp too. I have also seen 1903 and 1903A3 stocks with the rebuild SA GAW stamp
