Have you ever heard of error coins? Basically, an error coin is a mistake made when a coin is minted that affects the “look” of the coin. There are many types and they can even be found in circulation. Some are worth hundreds of thousands of dollars! Common errors include broad strikes, double-dies, and blank planchets.

 

Types of Error Coins

Broad Strike: Coin without a collar. Can be centered or uncentered, but must have full design.

 

Off-Center: Coin struck without a collar and off-center. 

 

Mechanical Doubling: Elements of the design appear doubled. Not a doubled die.

 

Die Break: Appears as a raised blob of metal on a coin. 

 

Cud: The coin has a raised blank area on the design caused when a significant part of the edge of the die deteriorates. 

 

Caps or Die Caps: Coin takes the shape of a bottle cap. Happens when a coin is struck and sticks to the die for numerous strikes.

 

Caps Die Strike: Disoriented or mushy image on a coin due to a coin capped around one of the dies that obstructs the die. 

 

Indent: When a blank planchet partially overlaps another planchet in the striking chamber and gets struck, the overlapping area on the struck coin will exhibit a blank indented area from the other planchet being struck into it.

 

Brockage: Occurs the same as an indent, but leaves a distorted mirror impression.

 

Struck Through Error: When a foreign object is on the planchet and leaves an impression of itself on the struck coin.

 


Weak Strike or Die Trial: Details of the coin, including the reeding, exhibit extreme weakness due to insufficient pressure from the dies on the planchet.

 

Curved Clipped Planchet: A curved area missing from a coin due to a planchet sheet not being fed far enough ahead and the punch overlapping an already punched area.

 

Straight Clipped Planchet:  A straight area of metal missing from a coin caused by a metal strip shifting during the punching process. 

 

Ragged Clipped Planchet: A ragged area missing from a coin caused by the punches overlapping the ragged ends of the strip. 

 

Wrong Planchet: A planchet is struck by a pair of dies that do not correspond. 

Double Denomination: Occurs when an already struck coin is struck by a pair of dies of a different denomination and show details of both denominations. 

 

Clashed Dies: Exhibit details of the obverse and reverse of a coin on both sides. Happens when a planchet is not fed into the striking chamber allowing the dies to strike each other. 

 

Lamination: Dirt and impurities in the metal manifest as cracks and peels. 

 

Split Planchet: A thin coin with rough striation from impurities or one side with full detail and the other blank and striated. Happens when an impurity is severe and the planchet splits.

 

Missing Clad Layer: A coin missing a clad layer will be copper-colored showing the exposed copper core. The other side is normal. 

 

Double Strike: A coin fails to be properly ejected after being struck and the die strikes again. Can be off-center or on-center like triple or multiple strikes. 

 

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