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2. Mint-made errors - Wikipedia

   en.wikipedia.org/wiki/Mint-made_errors

   Mint-made errors occur when coins are made incorrectly at the mint, ... This did occur occasionally with United States (and before that American colonial) coinage in ...

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. 4 Decades of Valuable Coins: See Which Are Worth the Most ...

   www.aol.com/finance/4-decades-valuable-coins-see...

   1960 Ben Franklin Half Dollar — Worth at least $11 or $12 today, potentially up to $300 or more in mint condition. Takeaways. Coin collecting can be a lucrative hobby, especially if you discover ...

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. 2004 Wisconsin state quarter misprint - Wikipedia

   en.wikipedia.org/wiki/2004_Wisconsin_state...

   In 2004, several coins of the state quarter series were printed with a misprint on the design for the Wisconsin coin. These coins featured an extra leaf on the left side of the corn cob on the coin. These coins become particularly valuable, often selling for several hundred dollars on sites such as eBay. [1]