page_title: US Error Coins
section_title: Mint Striking Errors
hierarchical_section_title: US Error Coins / Mint Striking Errors
caption_attribution_description: English: Lincoln cent off center
context_page_description: There are three categories of error coins as provided by the American Numismatic Association. Metal usage and striking errors referred to widely as “planchet errors”, die errors, and mint striking errors. This does not include the varieties that the US Mint has issued over the years.
  Since the inception of coin collecting there has been much controversy over what constitutes a true mint error. An organization of coin collectors named the Combined Organizations of Numismatic Error Collectors of America was created that specifically deals with mint errors.
context_section_description: Collectors and organizations dedicated to collecting coins regard mint striking errors as those that have been created by the minting process. Mint striking errors are caused by the collar moving, cracking, or not being present in the minting process. The collar is a third die that actually holds the coin in place in the minting process. It is the collar that imprints the lettering on a coin, such as the lettering on the Presidential dollars.
  Striking a coin with debris causes an indentation on the coin or the actual debris stamped into the coin.
  In order to mint any US coin a retaining collar is used to keep the coin in place while it is pressed between the dies. If the retaining collar breaks or is missing, the coin is struck so that the metal of the planchet is actually expanded outward producing a larger version of the coin with most of the details present. This error is known as a broad struck error.
  A coin that has been struck out of the collar and has double details such as two partial portraits, one normal and one that is overlapping and extending outside the normal circumference of the coin is denoted as a double striking error.
  A brockage results when a coin is stuck in the collar and another planchet enters the collar and is pressed against the coin already minted. The details of the coins produced have the appearance of mirror images of the obverse and reverse.
  A die cap is a coin that has been stamped a number of times and has the appearance of a soda cap. Metal flows around the side of the coin and the portrait appears deep in the coin.
caption: Lincoln cent off center
exif: {}