Hello,Jan, it is interesting that some of the early production "a" suffix G Date right receivers have an indention like many of the K Date Mausers. Your G Dates B-90 S-91 4249a ; B-90 S-92 4947a, and this example B-90 S-91 4674a have the mark. In "The Mauser Parabellum" pgs. 100 & 101, the authors state that "this is only found on K Dates". Apparently the process which caused the mark continued into the early G Date production until it was corrected.
Hi Jan, No need to apologize.Roberto I apologize for not crediting your original research on the indents on G dates. Adrian, thanks for pointing it out. Jan