Nice purchase, the correct cartouche is SA over GAW, your SA EMcF stock is valuable with such a nice cartouche. It is possible to somewhat date your EMcF stock with a few answers:

the clip latch cut (left side) curved on bottom or flat bottom ?

do you have the small crossed cannon stamp on the pistol grip flat ?

I have an original SA 2,77 mil with a SA 4-44 dated barrel, well used too.

trigger housing and bolt should be revision 12, trigger guard could either way: milled or early stamped (most are milled - no drawing number)Attachment 114092