Definitions of some types of Error coins
Clipped Planchet: An incomplete coin that is
missing 10-25% of the metal.
Multiple Strike: A coin that has additional
image from being struck again off center.
Blank: A blank of metal intended for coinage
but never struck with the dies.
Defective Die: A defective die will cause a
coin to show raised metal or have a small rim break.
Off Center: A coin that has been struck out
of collar and incorrectly centered with part of the design missing.
Broadstrike: A coin that was struck outside
of the retaining collar.
Lamination: A flaw with a fragment of metal
peeled off the coin's surface.
Brokerage: An error that reflects a mirror image
of the design impressed on the opposite side of the same coin.
Wrong Planchet: A coin that is struck on a planchet
designed for another denomination or metal.
Overstrike: A new coin produced with a previously
struck coin used as the planchet.