Even in such a bad condition,it's worth that much money...wow! Back in 1956 in Greece,most people still used mules for their fields.Buying a 4WD 50hp tractor must have cost a fortune,maybe that's why both my grandfather and his cousin were the owners,they couldn't afford it on their own.We are contacting the owner in the next days,i hope he will be willing to sell it.
Again,thank you everyone for helping even though i can't write in German.Sorry about that.