IDDD is presently looking for someone to run the Error Section, contact Tom on the contact us page.
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Blanks/Planchets: The metal discs which are struck into coins.
Broad-strikes: Error coins which are struck without the collar die present. Usually larger than the normal coin and missing any edge design.
Brockage: An indented strike due to another previously-struck coin adhering to the hammer die, creating an incuse (depressed) spread image on the coin.
Counter Brockage: Coin first struck normally, then a second time with a off-center with part of a struck brockage coin between the object coin and the one of the die's, shows on the coin as a strong off-center struck coin of any size and or location on one side of the coin, and as a matching off-center, shallow, irregularly rounded depression sloping up to the remainder of the coin with a slightly enlarged and distorted relief image of the intervening partial coin design.
Clashed Die's: Happens when a planchet fails to feed in to position causing the die's to crash together imprinting each design or part of onto the each other.
Clipped Planchets: Coins struck on incomplete planchets. Caused by malfunction in the Blanking Press.
Cuds: The cud error is caused by a broken die and results in an "unstruck" area on the coin. Die Chips & Cracks Caused by dies which are deteriorating and are damaged.
Double Denominations: When a previously struck coin is fed into a press tooled to strike another denomination, the coin will be a dual denomination strike.
Double/Multiple Strikes: Coins which fail to eject after the strike and are struck more than once creating multiple impressions.
Dropped Letter: Coins which were struck while a letter-bearing fragment from another struck coin caused an imprint of the letter into this one.
Folded Strike & Edge Strike: Coins which are struck and bent, and actually fold over on themselves. Also struck while they were vertical in the press.
Indents: When a planchet overlays another, and the two are struck together, the upper one will create a depressed indentation in the lower one.
Laminated Planchets: If the alloy for the planchet was incorrectly mixed the result would be a flaked or peeled planchet.
Mated Pairs: When two planchets are fed either overlapping or abutting and are struck once, the images will be shared by the two, and will mesh together.
Misaligned Dies: If the dies are not perfectly centered, one above the other, the struck coin will have incorrectly positioned images.
Mules: Coins created by a mismatched combination of dies. Dies of different denominations not meant to be paired.
Missing Clad Layers: A clad coin which is struck while one of the clad layers is either missing before the strike or falls away after the strike, is known as missing clad layer.
Off Center Strikes: A coin struck while improperly positioned and which has not been fed into the collar correctly.
Partial Collars: Coins struck while partly in the collar and partly out of the collar will have distinctive edge shapes which look like a flange or "railroad wheel".
Partial Brockage: Similar to an indent, but caused by a previously struck coin.
Struck-through hub: Coins that are hubbed with a foreign object and transford to the die.
Struck-Through die: Coins struck while there is extra or foreign material present on the die will have indentations or features created by the additional material.
Unplated coins: Coins which are made from planchets which usually have plating added. The plating was accidentally omitted during blank or planchet production.
Wrong Metal/Wrong Planchets: Coins struck on planchets which were not intended for that denomination.
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Clashed die's ( Eye socket clash mark )
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Clashed Die's: Happens when a planchet fails to feed in to position causing the die's to crash together imprinting each design or part of onto the each other.
Effects of a die pair that struck each other, without a planchet between the die's at the time of striking, images of each die ( Obverse & Reverse ) are added to the opposite die, creating what is called a clashed die.
Most of the time the clashed die's are abraded and effectively remove most of the clash mark, in rare cases we find coins of die representatives that have not been abraded, and are considered rare in this die stage.
The first two pictures show the clash mark in the eye socket area, the third shows the clash on the head area.
