If it is a semi-auto and made after 1957 it will be on the frame. I.E., Model 39 or Model 645-2. If by pistol you mean a revolver, you will have to open the cylinder and look in the recess where the crane/yoke rests.
value of smith & Wesson model 5906 pistol
No such model number.
Ask a gunsmith for help
100-460 or so
50-250 usd
it is a Model 39-2 9mm pistol
value of smith & Wesson model 5906 pistol
Smith&Wesson model 14
A fine pistol.
Smith and Wesson 6909 Stainless steel semi-auto pistol stopped produvtion in 2001
Smith and Wesson 9mm Model 39-2 Chrome finish.
No
No such model number.
No such model in the S&W line.
100-1200 USD
Made 1960-1974
Ask a gunsmith for help