I am thinking about buying an older Python 1955-1961 and have a few questions. 1) Other than the obvious, condition, what else should I look for to make sure it is a legitimate Python? What finishes were available and when did they start with the different finishes i.e. Blue, Nickel, other? 3) Sights, adjustable , fixed, one pin, two pin front? 4) Grips? 5) Original box, provenance? Fair market value ( for buyer and seller)? Anything else you can think of? The reason I am considering up to 1961 is because that is my birth year. Thanks in advance.