Very interesting US error, looks like a Washington quarter, not sure of date, struck on a nail! No idea about this at all, found in a very large job lots of world coins some time ago from an sale. No clue whether it is genuine or some kind of forgery, so please offer accordingly.
Please feel free to ask any questions, but I dont have many answers!
Please see my other rare coins. happy to combine postage on multiple lots. Items selling for over £30 internationally must go tracked at a cost of around £10