I am in the process of reproducing small telegraph keys. This key was used in a WWII spy radio that a lot of ham radio operators are reproducing. They are building everything except the key because of the difficulty in machining the small parts. I've already made two of these keys, but I don't know what to charge for the item. I've included 3 pictures of the original key. I know a lot of you guys are professionals, so If anyone can help me out it would be appreciated.