All sorts of different examples out there that defy establishing any single pattern. I have a Westinghouse converted to 91/30 with the rear sight welded on, like the Finn marked ones Vic mentions. But, it has no Finn connection, it came here in an import from Romania. Then there are a pair of all matching, 20's dated Dragoons (not converted). One is mine & the other belongs to a friend & forum member local to me. Judging them by numbering, stock & metal finish, they seem at first to be "all original, matching". But, they both have parts of mixed manufacturers. They seem to be earlier rebuilds, much higher quality than the refurbs we are so accustomed to seeing. Metal & wood finish appears identical to all original matching 91/30s from the late 1930s. Some say the mixed parts was common at original build in the '20s. To me, the early, higher quality Soviet rebuild of Dragoons, well after the full bore start of 91/30 production, seems more likely. The more one looks, the more confusing it becomes. So far, anyway. Spectulation we have lots of!