The Serial is on the butt. Sometimes on the frame under the crane but always on the butt. If made between 1954 and 1970 there will be an S prefix. After 1970 there will be an N prefix.
The "-2" is an engineering change made in 1962 (changed to left hand threads on the ejector or something like that). The "-3" eliminated the chamber counter-bore and barrel retaining pin in 1982.
All those other numbers you note are factory assembly numbers. No real meaning to us.
The "-2" is an engineering change made in 1962 (changed to left hand threads on the ejector or something like that). The "-3" eliminated the chamber counter-bore and barrel retaining pin in 1982.
All those other numbers you note are factory assembly numbers. No real meaning to us.
