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.
Try e-gunparts.com
Internet, gun shop, gun show, want ads.
50-200 USD or so depending on specifics
Nobody.
No public data available- sorry.