You need to leave this to a good gunsmith.
The Talon model 10 derringer was manufactured by General Precision Corporation in Waterford Ct.
The maker of your Derringer is no longer in business. Sorry-
125 usd
100-200
$75
His first model was produced in 1852.
The FMJ Ducktown Model D .45 Derringer is manufactured by FMJ Firearms, a company known for producing compact and reliable firearms. The Derringer design itself has a historical legacy, but FMJ Firearms has modernized it to cater to contemporary shooting needs. This model is particularly noted for its lightweight design and ease of concealment.
100-200 USD
50-100 USD
100 USD or so
$50-$75.
No published data