$450
if you allude to 38 S&W cartridge then you will find the case is shorter then a 38 Spl. case. You can fire a 38 S&W cartridge in a 38 Special but you can't fire a 38 Special in a pistol designed for the 38 S&W cartridge.
You will have to call S&W
The gun is likely a Harrington & Richardson (H&R) model 925. The caliber is .38 Smith and Wesson (S&W) special, not to be confused with .38 special (SPL). You must shoot the .38 S&W ammo, not .38 spl.
50-350 usd
50-350 usd
@ 1950
31 yrs old
10-1000 USD depending on specifics.
Both
41-42 years old
Impossible to answer without a detailed description of all features, condition, finish, box, papers, accessories, etc..