Years ago my uncle gave me his Model 1955 45cal. It is very used,and a little rough. It has a 61/2in barrel I changed out the front sight, red ramp (I don't think it is the right sight of the day), new hammer nose and bushing. He did his own table top smithing, reason for sight change. He shot it at Camp Perry and at other shoots. It has 45cal Model 1955 on the barrel and the numbers are S 146349, on the butt and barrel. I don't know any more than that. Can I get a little more history, if possible?