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2. 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 ...

3. Mercury dime - Wikipedia

   en.wikipedia.org/wiki/Mercury_dime

   The Mercury dime is a ten-cent coin struck by the United States Mint from late 1916 to 1945. Designed by Adolph Weinman and also referred to as the Winged Liberty Head dime, it gained its common name because the obverse depiction of a young Liberty, identifiable by her winged Phrygian cap, was confused with the Roman god Mercury.

4. 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 ]

5. US error coins - Wikipedia

   en.wikipedia.org/wiki/US_error_coins

   Doubled die coins are mainly created by a defective hub which is used to create many dies for the minting process. Collectors classify doubled dies as DDO (doubled die obverse coins), DDR (doubled die reverse) and OMM (over mint mark).

6. Die-deterioration doubling - Wikipedia

   en.wikipedia.org/wiki/Die-deterioration_doubling

   Nickel, one of the main metals used in today’s coins, is quite hard and causes wear quickly. Copper has been used for centuries because of its malleability and the ease with which it makes coins. However, it too wears the dies when they are used for too long. An infamous example is the 1955 "poorman’s double die."

7. Dime (United States coin) - Wikipedia

   en.wikipedia.org/wiki/Dime_(United_States_coin)

   The composition (90% silver, 10% copper) and diameter (17.9 millimeters) of the "Mercury" dime was unchanged from the Barber dime. Weinman (who had studied under Augustus Saint-Gaudens ) won a 1915 competition against two other artists for the design job, and is thought to have modeled his version of Liberty on Elsie Kachel Stevens, wife of ...