This is a NON FIRING replica of the early Deringer pistols. They sell for around $30-$40 new. They are not working firearms.
What is the value of a Davis Derringer pistol magnum 2 shot?
I THINK your derringer may be a RECK. Value about $25-$50.
35-90 USD
20-80 usd
10-60 usd
20-50 USD
10-40 USD
10-50 USD or so
10-140 USD depending on specifics
Question can't be answered. Not enough information. What are the exact barrel markings and wording? What is the overall condition?
You never specified a make and model. You could be looking at anywhere from $30 - $150, all things dependent.
There is no .25 Magnum. There IS a .22 magnum, made by Davis, and a .25 ACP. Value is about $50-$75.