I really don't see anything real unusual. To me the slot looks like it has not been touched in a long time. I only have one double slot stock and have not checked to look for a clean hole or not? The "SA" stamps do seem slightly odd placed but nothing that would suggest anything significant in my eyes. The stock appears slightly blonde but the pics are not the best. Other that I think it looks about as right as any other M28. I wouldn't kick that one out of my rack for sure. Congrats. I like it. Regards, John.