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2. Mint-made errors - Wikipedia

   en.wikipedia.org/wiki/Mint-made_errors

   In general, lower denomination errors are less expensive than higher denomination errors simply because more such coins are minted resulting in available errors. Due to improvements in production and inspection, modern errors are more rare and this impacts value. [ 3 ]

3. 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.

4. 12 of the Rarest U.S. Mint Error Coins Worth a Fortune - AOL

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

   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 ...

5. 5 Most Valuable ‘Error Coins’ Ever Minted — Check ... - AOL

   www.aol.com/5-most-valuable-error-coins...

   Strike Errors: “Striking” is a part of the minting process when the design from the die is impressed onto the coin. Strike errors include off-center or misaligned strikes and designs struck on ...

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

   www.aol.com/3-errors-coins-worth-much-165432842.html

   Strike errors: A “strike” is what happens when the design from a die is impressed onto the coin. Strike errors include off-center or misaligned strikes, or designs struck on the wrong size ...

7. 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 ...