Wesson made a few different types
Smith and Wesson
100-1000 USD or more.
Browning, Colt, Ruger, Smith and Wesson, Walther, Hammerli
1961-1988
100-1000 USD or more depending on specifics.
50-250 usd
You will have to call S&W to find out.
1948
100-300 or so
Standard Catalog of Smith and Wesson, 3rd ed.
You can request a owner's manual for free at the S&W web site.
Use a snap cap to be on the safe side.