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2. US error coins - Wikipedia

   en.wikipedia.org/wiki/US_error_coins

   Collectors classify doubled dies as DDO (doubled die obverse coins), DDR (doubled die reverse) and OMM (over mint mark). 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 ...

3. Mint mark - Wikipedia

   en.wikipedia.org/wiki/Mint_mark

   Segovia, Spain used an aqueduct, a local landmark, before it switched over to the star system in 1868. The private mint of the French Coinage Society Poissy Branch used a thunderbolt mint mark on coins of France, its colonies, Romania and other countries. [18] Privy mark (left) and mint mark on a Dutch coin. The mint mark is that of the mint of ...

4. 9 Rare Coins That Can Make You Rich - AOL

   www.aol.com/9-rare-coins-rich-120009603.html

   This rare coin sold for over $7,000 at an auction in 2017 as it has become a collectible item due to the fact that there’s no mint mark. The lack of a mint mark means that there is no marking on ...

5. Mint-made errors - Wikipedia

   en.wikipedia.org/wiki/Mint-made_errors

   A well known example of a small mint mark is 1945-S "Micro S" U.S. Mercury dime, when the mint used an old puncheon intended for Philippines coins. [14] A much rarer example is the 1892-O "Micro O" U.S. Barber half dollar , which may have come about from the brief use of a mintmark puncheon intended for the quarter. [ 15 ]

6. These 11 Rare Coins Sold for Over $1 Million

   www.aol.com/11-rare-coins-sold-over-130146321.html

   Over time, coins can become rare collectibles that are sold for thousands, if not millions, of dollars in the present day.That’s because the United States has been minting coins since 1793. Up ...

7. 29 of the Most Valuable Coins Ever Minted — 9 Are Worth Over ...

   www.aol.com/finance/29-most-valuable-coins-ever...

   A coin can be worth a ton of money -- a pretty penny, one might say -- if it's rare and has enough historical significance. Find Out: These 11 Rare Coins Sold for Over $1 Million Explore More ...