And regarding the diamond stamp on receiver cover, one opinion (shared by a few long time SKS collectors) is that it alone is more like an inspection (may be pre-refurb inspection) mark, which may not necessarily mean the rifle has gone through the actual refurb process. Personally I have seen this stamp on several obviously-appear-to-be nonrefurb SKS's, especially on two 1954 Izhevsk's. However, I don't have any documented evidence to tell whether it indicates a specific refurb arsenal.
Yup I've heard this theory and have to this point, seen absolutely, positively
zero evidence to support it beyond a "In my expert opinion (because I am an expert SKS collector and therefore an authority on *all* things SKS) this gun does not look refurbished to me, thus that mark cannot be a refurb mark (
besides if it was a refurb mark, my gun would be worth less by $XXX!)"
Something like this w/o evidence (even a tiny shred) to back it up is just internet legend as far as I'm concerned. What is documented is this (not all seen on SKSs, but many are and others that don't are well researched by Chumak et. al. as you know):
5th GRAU @ Alatyr
75th ABV @ Leningrad
Unknown stamp tentatively called "D0" here at SKS-Files (this one may or may not actually exist, it may be a light strike of any of the others):
Unknown stamp tentatively called "D2" here at SKS-Files:
Unknown stamp tentatively called "D5" here at SKS-Files:
Unknown stamp tentatively called "D6" here at SKS-Files:
http://i1352.photobucket.com/albums/q647/jelucer/survey/russian/refurb_marks/D6_P.jpg~originalUnknown stamp tentatively called "D7" here at SKS-Files:
D ABV Turkestan Military District @ Solnech
No. 7 Leningrad (I have 1945 down as well, I'll need to go back through my notes and see why I put that in there)
I find it a hard pill to swallow that all these others are 'known' refurb facilities yet D0 is magically *not* a refurb facility. Just my opinion of course, but I think it's well thought out and fairly well grounded when the above is shown.