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I didn't get, from your OP, that you wanted the date of manufacture.
The S&W Customer Service TN is (800) 331-0852, # 7.
The CS person can usually tell you the DOM (if called during business hours), or you can request / get the gun lettered by S&W for a $35.00 fee.
AFAIK, there is no online source for S&W SN's.
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