I am building a shooter with a 12" barrel and recently purchased a receiver with a 4" barrel that will be removed. The receiver is dated 1940 and has the proper proof marks on the right side to be off a 1940/42. The odd proof is on the underside of 4" barrel. It is a 623 over an eagle. I have looked in the five books I have, and cannot find that proof anywhere. Can anyone shed any light on this proof mark? BTW the receiver is nickled or chromed. Does anyone know if that can be removed?
Thanks,
Mike
