I’m going have to agree on P.W. And, thank you very muchCool... Q1 is the 1972 date code so that works out. I think the number on right side of frame and slide (45xxx) is a military property/rack number. The long number on left of frame is the actual S/N. IMHO PW ARMS wins the prize for the all-around worst import marks - at least this one is a clean, nicely-aligned rollmark/stamp and not one of their horrid dot-prick drunk monkey versions