This is another issue with American arms, and actually most surplus in general is as time progresses what is original and what is added/changed/modified becomes harder and harder to tell. What did the original finishes look like? How where they surplussed? There isn't many left in the grease to buy anymore and the amount of people who pulled them out of the grease originally is slowly declining. Really makes it hard to say anything definitively. This is also part of the reason I tend to stick with odder military surplus firearms as the odds of them being messed with are significantly lower than the more popular ones.