When I see an older, all matching Mosin the first thing I start looking at are the serial number stamps to see if the "font" of the numbers are all the same. I don't know if that's an important issue but I get nervous if all the 2s, 3s, etc don't match. I've seen several rifles where all the number fonts match except the receiver. Is that common? Or maybe the better question is does that mean the other numbers were stamped during rearsenal to match the original receiver? Or maybe even the receiver has been replaced and stamped to match the rifle. I kind of doubt that one but who knows? It may sound like nitpicking but after you've collected a few common examples of these rifles, you start looking for something special (or at least out of the ordinary) like a rifle with all matching, ORIGINAL, parts.