I have been given a Percar Berlin 4-10 German by a friend, its been through the wars as the outside is showing signs of rust. However it still works fine and is optically very good. I'm thinking of sticking it on ebay. I have no idea given its condition if it is worth anything, if I had not looked through it and noticed how good the optics were I might of discarded it. I know there's plenty of knowledge on here, can anyone help ?