Originally Posted by donk52

My stamp started as "0" and I changed to a "C" later when I transitioned to fitting the 9mm and 22's (Mod 41's). I never worked with the three letter prefix only the A. When I started fitting the Mod 52, around 1979, there were seven of us on the bench. I was eventually the only fitter left when they started phasing it out. When I went on to fitting the other semi autos there was one person to build them, using up the remaining parts. I believe thats probably when the three letter prefix began and changes in the frame occurred. The semi autos by that time were ramping up and I was put in charge of teaching a group of revolver fitters to build semi autos, this around the time of the first Army trials. Semi autos were becoming very popular. Just before I left S&W, 1989, I was building the first of the 645's and 745's.