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  2. US error coins - Wikipedia

    en.wikipedia.org/wiki/US_error_coins

    The over mint mark is created when a one date and mint mark is punched over another date, part of a date, or mint mark. These coins are generally restricted to the early minting process of coins dating before the turn of the century. The DDO and DDR errors are related to any part of the coin that shows a distinct doubling.

  3. Mint-made errors - Wikipedia

    en.wikipedia.org/wiki/Mint-made_errors

    Such errors are sometimes called "double denomination" coins, but that term is also used to refer to coins struck a second time with dies of a different denomination. Some examples include cents struck on dime planchets, nickels on cent planchets, or quarters on dime planchets.

  4. Die-deterioration doubling - Wikipedia

    en.wikipedia.org/wiki/Die-deterioration_doubling

    However, it too wears the dies when they are used for too long. An infamous example is the 1955 "poorman’s double die." This coin is sold as a replacement for the 1955 doubled die cent, but it is no more than Die Deterioration Doubling, caused by wear on the dies. When a coin is struck, the planchet is not heated. Although the planchet would ...

  5. One of the most famous Doubled Die cent errors occurred in 1955, according to the Numismatic Guaranty Company. Today, these mistakenly-made pennies have a retail value ranging from $1,000 to ...

  6. Die defect - Wikipedia

    en.wikipedia.org/wiki/Die_defect

    A die crack occurs when a die, after being subjected to immense pressure during the minting process, cracks, causing a small gap in the die. [3] If this damaged die continues to produce coins, the metal will fill into the crack, thus revealing a raised line of metal in the finished coin.

  7. Doubled die - Wikipedia

    en.wikipedia.org/wiki/Doubled_die

    Doubled die varieties, when noticeable to the naked eye or occur in a popular coin series, are extremely popular with collectors and can be worth a large premium over the same coin without the doubling. The most popular doubled die variety would be the 1955 US cent doubled die [1] which typically sells for over $1000 at auction. [2]

  8. 1984 Summer Olympics commemorative coins - Wikipedia

    en.wikipedia.org/wiki/1984_Summer_Olympics...

    A ten-dollar gold coin (a.k.a. Eagle) was released in 1984.This coin features male and female Olympic torch runners.Of the 2,000,000 coins authorized by Public Law 97-220, a total of 497,478 proof coins were minted at the four mints (a majority at the West Point Mint), and a further 75,886 uncirculated coins were minted at West Point.

  9. Lincoln cent mintage figures - Wikipedia

    en.wikipedia.org/wiki/Lincoln_cent_mintage_figures

    Below are the mintage figures for the Lincoln cent. The following mint marks indicate which mint the coin was made at (parentheses indicate a lack of a mint mark): P = Philadelphia Mint. D = Denver Mint. S = San Francisco Mint. W = West Point Mint