Yen Vi Megaupload What Should I Do With These Old Japanese Coins And How Much Is This Coin Worth?

What should i do with these old japanese coins and how much is this coin worth? - yen vi megaupload

I like a lot of old pieces of ¥ 500, and 100 Japanese yen and the currencies of all types, including Jerman, some of them are rusty future, I clean rust or leave them alone?
I think I should leave her alone, I might get something too much for one day and oh, how much is a 1938-dollar value that the SAI GEORGIVS VI D: G: BR: OMN: REX F: D would be: IND : IMP. I think it is Greek or German or something, but is very old, how much American money?