Around $300.
125 or so
If you don't have a manual, find a gunsmith and ask for help.
225
The first production semi auto pistol was the Mauser c/96 "broomhandle" pistol.
It is a semi auto PISTOL, not a revolver. Value depends on exact model and condition. Roughly $100-$350.
40-100 or so
75-150 dollars.
100-1000 USD depending on EXACTLY what you have.
50-300 depending on speicifics
50-100 or so
50-250 USD or so
10-1000 USD depending on specifics