Welcome to the forum.
Your information concerning the factory "work" numbers is correct. The numbers on the yoke (4481) and on the frame under the grips are used to keep the fitted parts together during the fitting/manufacturing process. These numbers have nothing to do with the serial number.
The model 36-1 serial number J615939 dates to 1977. Looks like a great example of a factory nickel model 36 to me.
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Ret. LE, FA Instr, S&W Armorer
Last edited by armorer951; 10-15-2020 at 05:02 PM.
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