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  2. 12 of the Rarest U.S. Mint Error Coins Worth a Fortune - AOL

    www.aol.com/finance/12-rarest-u-mint-error...

    Some of the rarest and most valuable coins in U.S. history owe their worth to minting errors that slipped through unnoticed. Coins like the 1943 Copper Penny, struck in copper instead of wartime ...

  3. This coin is a fascinating example of a flawed minting process, which resulted in a buffalo with three visible legs. The highest price paid for this coin was just shy of $100,000. 1942/1 Overdate ...

  4. 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.

  5. Mint-made errors - Wikipedia

    en.wikipedia.org/wiki/Mint-made_errors

    An example is a coin struck with dies designed for different coin denominations, or a coin struck with two dies that both lack a minting year on them, resulting in a ...

  6. 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 ...

  7. These 3 Errors Make Coins Worth Much More Than Face ... - AOL

    www.aol.com/finance/3-errors-coins-worth-much...

    The late painter and PBS icon Bob Ross famously said there are no such things as mistakes with art, only "happy accidents." When it comes to the art of coin production, those happy accidents can ...