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1980's. Call S&W and they will tell you when it left the factory.
This was made in 1966
1978-79.
The gun was made in 1922.
This gun was made in 1968
@ 1975
50-500 usd
Proofhouse.com has sn tables that you can use.
No known sn data published.
93-94 time frame.
About 1993-1994. You can check with Uberti for an exact date.
About 1978. Proofhouse.com shows 1977 ending with serial number 71400R