Hi, I have a question regarding a handgun that my cousin is trying to sell me. I don't know alot about handguns, but he needs some cash, and I don't want to get robbed. It is a 357 magnum, and on the gun "Arminius and H. Weihrauch". It also says "Made in Germany". How can I find out the value and history of this gun? Any info is greatly appreciated.