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.
100-200 USD
100 USD or so
$50-$75.
50-100 USD
No published data
IIRC, they made a model called that.