$400
We need a make of derringer.
Yes, many have been made in 38 Special
That depends entirely on what it is. Who made it and what is its condition?
50 USD or so
50
Leave this to a trained gunsmith.
Depends on the exact MAKE and MODEL, but typically anywhere from $150-$225 or so.
Impossible to answer without knowing the model and who made it.
i have a rg 38 special i need to no the price of it
50-260
No way to answer without a make and model. Serial numbers aren't unique to one firearm.