Bill, right after WWII ended, S&W shipped some M&P's with SV serial prefixes, plugged lanyard ring holes and commercial finishes. New commercial frames with S prefix serials did not have the lanyard holes and I believe that is the only difference. I also believe the single line and 4 line frames are the same except for the stampings.
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Guy
SWHF #474 SWCA LM#2629
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