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2. 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.

3. 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 ...

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. 9 Rare American Coins That Are Worth a Lot of Money - AOL

   www.aol.com/9-rare-american-coins-worth...

   The Standing Liberty quarter remains “among the most collectible old coins ever made” by the U.S. Mint, according to Gainesville Coins. The coin’s design made its debut in 1916 but was ...

6. 2000 Sacagawea dollar – Washington quarter mule - Wikipedia

   en.wikipedia.org/wiki/2000_Sacagawea_dollar...

   Mule coins were deliberately produced by US Mint employees for sale to coin collectors in the mid-1800s. [3] However, no authentic (accidental) mules of United States currency were known to exist. This changed in the 1990s, when a Lincoln cent (dated 1993-D) with the reverse of a Roosevelt dime were discovered.

7. American Silver Eagle mintage figures - Wikipedia

   en.wikipedia.org/wiki/American_Silver_Eagle...

   The obverse of the American Silver Eagle. The American Silver Eagle is a United States bullion coin that has been minted since 1986. Each coin is .999 fine silver. Circulating coins have been minted at the Philadelphia Mint, San Francisco Mint, and West Point Mint, though do not bear a mint mark. Proof and uncirculated coins do have mint marks ...