People smarter than me will be along shortly with better information. In the meantime, I think you have a Smith and Wesson .38 Double-Action Second Model circa 1880-1884. Caliber .38 S&W (not .38 S&W Special). Five shot fluted cylinder. Barrel lengths were 3 1/4", 4", 5", and 6". I can't tell how long your barrel is, measure from the muzzle to the front of the cylinder. Black hard rubber grips with S&W monogram. Serial number range 4001-119000 with roughly 115,000 manufactured.

Hard to assess the value because of the possibility of a recent refinish as Otis24 suggests. If the bore is good and it locks up, it might be worth $200-$250 as a shooter. Be advised, however, that this is a black powder era firearm. I would advise against shooting it with modern smokeless powder ammunition.