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About $250.
@1959
1964-1984
25-100 usd
5-200 USD depending on specifics
About $450, depending on condition.
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.
10-140 USD depending on specifics
100-200 USD
You need the services of a qualified gunsmith
Yancy Derringer - 1958 Hell and High Water 1-20 was released on: USA: 19 February 1959