Hello gentlemen; recently the market here (as in USA, I guess) has been invaded by hundreds of 91/30 PU's, coming from Russia. These guns are genuine snipers, but reworked post war at different stages by the arsenals down there... It means that in most cases the scope and the stocks have been replaced and/or refurbished, the metal reblued, bolts changed and restamped and so on.
But there were some needles in the haystack.
I found this one which is almost mint: Izhevsk factory made it (I guess, judging by the block suffix) around the end of 1944, if not at the beginning of the 1945, and I strongly doubt it was issued and fielded; so, probably, left alone and not refurbished because it was as new.