Gun shows, gun shops, want ads
The maker of your Derringer is no longer in business. Sorry-
20-80 USD depending on specifics
5-10
Whatever is available ought to be OK. (40grains.....)
contact: cobra.pistols.net They have the parts in stock
Ask a gunsmith to show you.
try pawn shops, gun shops, gun shows, want ads, for sale ads
Contact Customer Service
Check with a gunsmith. My usual spare parts places do not have hammers for the Davis derringers in stock. It may simply be a matter of luck in finding one. Sorry-
50-150 USD
50-625 usd
model 57 22 cal was made from 1959-1965. the model 57 mag was made from 1960-69.