No way to answer without detailed information on all markings and features.
1980
Impossible to answer without the serial number.
25-450 usd
100-450 or so
This is for SMITH and WESSON firearms.
Call S&W and they will tell you.
1974
100-500 USD
50-500 usd
@1984
Approximatey $425.00
1956-1957