It is a cheap German-made revolver of uncertain quality.
175 USD
50-165 USD
It is a dual action revolver
yes u could
Yes
If it's made out of gold, weigh it and use the daily spot price of gold to determine value. If gold plated, about 200 USD.
Internet, gun shop, gun show, want ads.
Try e-gunparts.com
50-200 USD or so depending on specifics
Nobody.
No public data available- sorry.