Your gun is likely a five shot top break chambered for .38 S&W (not the more modern .38 S&W Special). While the gun may function well, it is an antique which should not be routinely fired. It has primarily collector value which is based on the condition of the gun.
Have the gun appraised by a knowlegible gunsmith or collector.
100-1000 USD
About $400.
The worth is $539
100-1000 depending on EXACTLY what you have.
No such model in the S&W line.
50-400 usd
25-2500 usd
No serial number given.
100-1000 USD or more depending on specifics.
50-475 usd
With no other information, 100-500.
50-400 usd