Common coin errors
An error coin is a coin that is minted abnormally. Many different types of errors can occur during the minting process. The following are some of the most common error types.
Numismatic value of error coins
Most error coins demand a premium when sold, if they are modern coins, dependent upon the rarity of the type of error as well as the rarity of that type of error on a particular denomination. The value of error coins has been subject to much debate and the value is usually determined between the dealer and the collector. Conversely, errors on ancient, medieval and higher value coins are usually detrimental to the coins numismatic value.
Blank or planchet
This is simply a
planchetintended for coinage but not struck with a die. In the process of minting, planchets are first struck from strips of thin metal. A planchet on which the rims have not been milled upward is more valuable than a processed planchet. Note: The rim on a blank is not raised, while the rim on a planchet is raised.
A coin shows a raised line on its surface. This is caused by a crack in the die used to strike the planchet. Coins sometimes show an unstruck area resulting from a break in the die. This is known as a
cudmark. In U.S. coinage, many coins from the Morgan Dollarseries show slight die cracks.
A coinage defect consisting of a portion of the metal separating from the rest due to impurities or internal stresses. Lamination flaws occur primarily when a foreign material or gas oxide becomes trapped within the planchet (the metal blank used as a coin). This error is especially common to the modern US Cent having a zinc metal base plated with a thin sheeting of copper.
This error occurs when the
coinhas been struck outside of the planchet, due to the planchet improperly entering the coinage press.
Broadstrike errors are produced when the collar die malfunctions. The collar is the circular die surrounding the anvil (lower) die. It applies the edge device (reeded edge, plain edge) and prevents the metal of the coin being struck from flowing outside of the confines of the die. When the collar is prevented from working properly during striking, it may rest below the surface of the anvil die. All denominations of U.S. coins with a broadstrike have a plain edge.
Occasionally a misfeed can occur where a
stripisn't fed through far enough. When this happens, the punches strike an area of the strip which overlaps the hole left by the previous strike. The result is a blank with a piece missing.A clipped planchet is straight, curved, ragged, incomplete, or elliptical.
This occurs when a denomination is struck on a planchet of a different denomination. Some examples include cents struck on dime planchets, nickels on cent planchets, or quarters on dime planchets.
Sacagawea dollars have been reported with statehood quarter designs on the reverse. A much rarer error is a U.S denomination struck on a foreign planchet (17th,18th, and 19th centuries only).
A mirror image of a coin has been struck on both sides of the planchet. This error typically occurs when a coin remains on either die after striking. The second coin receives the image from the die, though its blank other side also receives the image of the struck coin. The result is an incuse mirror image, and the coin is known as a brockage error.
This occurs when the coin has an additional image on one side from being struck again, off center. The result is sometimes mistaken as being a "doubled die". Note: Also referred to as 'double exposure.'
In the past, it was a common practice for a mint to use a certain die until itbroke. As some dies would last for multiple years, a figure would be punched over the old date. For example, some 1942
Mercury dimes show a 1 beneath the 2.
* [http://www.coinpeople.com/Error-and-Variety-Coin-Forums-f15.html CoinPeople.com Error Coins Forum] - An interactive forum with pictures of error coins and detailed explanation of how these errors occur.
* [http://www.errorsoncoins.com Errors On Coins] - Pictures of error coins and detailed explanation of how these errors occur on various coins.
* [http://www.coinsgb.com British Coins] - Free information about British coins. Includes an online forum and a section on error coins.
Wikimedia Foundation. 2010.
Look at other dictionaries:
Coin collecting — This article is about a hobby. For the scientific study of currency, see Numismatics. Numismatics Terminology … Wikipedia
Penny (United States coin) — Cent (Penny) United States Value 0.01 of a U.S. dollar Mass 2.5 g (0.080 troy oz) Diameter 19.05 mm (0.750 in) Thickness … Wikipedia
Mint-made errors — are errors in a coin made by the mint during the minting process. Mint error coins can be the result of deterioration of the minting equipment, accidents or malfunctions during the minting process, or intentional interventions by mint… … Wikipedia
Nickel (United States coin) — This article is about the U.S. coin; for its Canadian counterpart made intermittently of 99.9% nickel between 1922 1981, and also called the nickel, see Nickel (Canadian coin). This article is specifically about the U.S. five cent coin; for its… … Wikipedia
Mule (coin) — An example of a Heraclius mule In numismatics, a mule is a coin or medal minted with obverse and reverse designs not normally seen on the same piece. These can be intentional or produced by error. This type of error is highly sought after, and… … Wikipedia
Numismatic terminology — This article is a collection of concise Numismatic and coin collecting terms for the beginner or professional. Numismatics (ancient Greek: polytonic|νομισματική) is the scientific study of money and its history in all its varied forms. While… … Wikipedia
Glossary of numismatics — For banknote collecting, see Notaphily terminology. For stamp collecting, see Philately. Numismatics Terminology … Wikipedia
Wikipedia:Featured article candidates — Here, we determine which articles are to be featured articles (FAs). FAs exemplify Wikipedia s very best work and satisfy the FA criteria. All editors are welcome to review nominations; please see the review FAQ. Before nominating an article,… … Wikipedia
Coins of the pound sterling — The Royal Shield reverse designs, introduced in 2008 (£2 coin is not shown) … Wikipedia
Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity. Computer scientist Manindra Agrawal of the… … Universalium