Numismatic Dictionary

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There are 32 names in this directory containing the search term error. Clear results.
Blakesley Effect
On a coin with a curved clip error, the edge opposite of the curved clip has a weak or missing rim. See also clip.

Bowtie Clip Error
A type of error coin that was punched on a scrap of metal punched from the webbing created when blanks are punched from the metal sheets. The scrap was punched from the web-like sheets and the resulting scrap resembles a bowtie. The scrap is mixed with the other planchets and is punched with the working dies.

A type of striking error when the coin is not ejected properly from the press and causes the mirror image of the exposed design to be struck on the next coin.

capped die
An error in which a coin gets stuck on a die and remains stuck for successive strikes. Eventually, the coin forms a "cap" on the die and imparts its image on coins it strikes. When the cap falls off, it usually resembles a small bowl.

cherry picker
A collector who searches for scarce or otherwise valuable coins by searching old collections, hoards, and old stock from dealers. Modern cherry pickers look for coins with errors or slight changes in design caused by differences in the dies used to strike coins.

Combined Organization of Numismatic Error Collectors of America

Double-die obverse when the elements on the front of the coin appear to be doubled. See also double die or error.

Double-die reverse when the elements on the back of the coin appear to be doubled. See also double die or error.

doubled die
A die that has been struck more than one time by a hub in misaligned positions, resulting in doubling of design elements. See also error.

A term that describes numismatic item that has a variation caused a mistake in the striking or printing process.

feeder finger
A part of the coining machine that feeds the planchet into the striking chamber. Occasionally, feeder fingers have broken free and struck by the dies. This is rare type of error coin.

filled die
A type of error that appears on a coin when a foreign substance, such as grease, fills the elements of a die used to strike coins.

A piece of die steel showing the coinage devices in relief, or raised, as they are on a coin. The hub is pressed into the blank die, resulting in an incused, mirror image on the die. The die is then pressed into a planchet, or coin blank, on a coining press, to produce a coin. See also error.

hub doubling
Refers to the doubling of the elements on a coin that was caused by the hub being pressed more than once into a die in different angles. See also error.

Lamination is a type of error in the planchet that occurs when a thin layer of the metal splits or peels away from the surface of the coin. See also planchet flaw.

machine doubling
A type of error that occurs when the coin is struck more than once.

mint error
A coin that that is flawed as a result of a mistake that occurred during its production at the United States Mint. See also error.

Term applied to coins with striking irregularities. See also error.

misaligned dies
A striking error caused by one or both dies not set properly in the coining machine or worked loose during striking.

missing clad layer
A type of error that occurs when part of the metal of a clad coin separates from the planchet.

A mule is a type of mint error that occurs when a coin is struck with two dies that were not intended to be used together. See also error.

A type of mint error when the coin was struck more than once. A multiple-struck coin can show the design as it is struck in multiple places.

off metal
A type of error that occurs when a coin is struck on a planchet that it is not normally struck, such as striking of a quarter on a planchet that was supposed to be for a nickel.

omitted design
These errors are the result of elements missing from the master dies when working does were created. Missing elements can include omitted dates, mintmarks, legends, or parts of the design not included on the master die.

A type of minting error when a coin, token or medal is struck on a previously struck coin, token or medal.

Partial Collar Strike
A type of striking error where a planchet does not enter completely into coining position and is struck partly within the collar and partly outside. See also collar.

repunched dates
When branch mints needed to use dies from a previous year, the new year would be punched over the old year leaving remnants of the old date on the coin. These are very collectible errors.

rotated dies
A type of mint error caused by the dies not being aligned when striking the coin, token or medal.

strike doubling
An error that appears as doubled elements when a coin is struck more than once. See also error.

struck through errors
These are errors that are seen on coins that were the result of debris or other foreign matter that entered the striking chamber of the coining press. The most common struck trough errors is when grease that is used to preserve the dies during the striking process is applied too heavily and prevents the dies from making a strong impression on the planchet.

struck-on error
A type of error that occurs when a coin is struck on a different planchet than it was supposed to appear. See also off metal.

A slow, natural and normal process by which a coin oxidizes over a number of years from contact with the environment. Coins that have been naturally toned are not considered errors.

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