You will need to call S&W to find out.
1957-67
smith and Wesson has a collectors site, Google it.
50-375 usd
67-77
67-77
1980
1973
If you call S&W, they will tell you when it left the factory.
100-400 USD or so
50- 300 uSD
The smith and Wesson model 14-2 was made by smith and Wesson between the years 1961-1966.I,m sorry but that is the best I can do.
That sn does not follow normal S&W conventions. You need to call S&W. the 15-3 was made from 67-77.