I found a quarter that is thinner than usual, and one side appears to be copper. Do you think that this is a true error or a manipulation?
May 18th, 2009
It’s a minting variety, caused by wear and tear, with one of the clad layers splitting off, either before or after the coin was struck. It could also have been removed after leaving the mint so it needs to be checked by a specialist. If it is a genuine error, it may hold numismatic value.