$50-$75.
Impossible to answer without knowing the model and who made it.
7627
That depends entirely on what it is. Who made it and what is its condition?
35-90 USD
$400
50
No published sn data
25-75 US dollars
35-100 USD or so
Depends on the exact MAKE and MODEL, but typically anywhere from $150-$225 or so.
We need a make of derringer.