Welcome to the forums from the Wiregrass, Lexcanis. It would be better if you posted your question in the right forum and not piggy backed on another thread in the Antiques forum. Your 9mm, 5904 was made in the late 1980s. If you call S&W Service, they can tell you exactly when.
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Guy
SWHF #474 SWCA LM#2629
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