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

   www.aol.com/12-rarest-u-mint-error-140056411.html

   Jitalia17/istockphotoSome 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 ...

3. US error coins - Wikipedia

   en.wikipedia.org/wiki/US_error_coins

   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.

4. Mint-made errors - Wikipedia

   en.wikipedia.org/wiki/Mint-made_errors

   Mint-made errors occur when coins are made incorrectly at the mint, including anything that happens to the coin up until the completion of the minting process. [1]

5. 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 ...

6. Category:Mint-made errors - Wikipedia

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

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7. VAM (Morgan and Peace dollar die varieties) - Wikipedia

   en.wikipedia.org/wiki/VAM_(Morgan_and_Peace...

   There are in more than 3,000 different VAMs however the coin certification company Professional Coin Grading Service (PCGS) does not recognize all of them. They recognize 52 VAM Peace dollars and 317 Morgan dollar VAMs [2] A VAM can be a small change in dies like a different sized mint mark, or something more dramatic like a repunched date.