25-100 usd
About $250.
About $450, depending on condition.
100-200 USD
50-150 or so
10-140 USD depending on specifics
@1959
1964-1984
50-100 dollars
5-200 USD depending on specifics
Fine quality.
A High Standard with a 2 inch bbl is likely a derringer, and is not meant to be disassembled by the owner. Take it to a gunsmith.
Your derringer was made in the 1960s and 70s.