It depends. SOME models can be looked up in the Blue Book of Gun Values, but most can't. Normally, you have to call the manufacturer, and normally, they will charge you to look up the information.
You must call S&W to find out.
1973
@ 1978
1980
1971 sales@countrygunsmith.net
Early 80's.
No published sn data
Call S&W and they will tell you when it left the factory.
If you provide the serial number in your question then I can give you the date of manufacture.
By it's serial number.Go to proofhouse.com to find the date of manufacture.
If you would post the serial number and model number,I can give you a date of manufacture.
If it has the 17 digit vin, the 10th digit is the code date of manufacture.