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2. 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 'dateless' coin. Misaligned dies [ edit ]

3. US error coins - Wikipedia

   en.wikipedia.org/wiki/US_error_coins

   Before 1990, all US coin dies were subject to mint mark errors resulting from the preparation of the dies. The mint mark was hammered into the die manually sometimes causing a die to have a doubling. In the minting process this would create a series of coins with a distinct of slight doubling of the mint mark.

4. Die-deterioration doubling - Wikipedia

   en.wikipedia.org/wiki/Die-deterioration_doubling

   In modern presses, a die strikes approximately 120 coins a minute. This is a large number of coins produced in a short time, and obviously the die cannot last forever. However, the process of wearing the die is only hastened by the metals used in coins. Nickel, one of the main metals used in today’s coins, is quite hard and causes wear ...

5. Collecting Problems: U.S. Mint Faces a Coin Cost Dilemma

   www.aol.com/news/2010-05-11-collecting-problems...

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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. Category:Mint-made errors - Wikipedia

   en.wikipedia.org/wiki/Category:Mint-made_errors

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