Here are some additional photos of the Winchester stock, note: the barrel channel, trigger guard recess and pistol grip angle - all unique features to Winchester production. What is not visible is the ferrule code which is also Winchester.
I had a nice 1903A3 stock with the SA GAW rebuild cartouche and have seen a 1903 type C stock also with the SA GAW rebuild cartouche too.
Attachment 17761 - Attachment 17762 - Attachment 17763