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  2. US error coins - Wikipedia

    en.wikipedia.org/wiki/US_error_coins

    The 3-legged Buffalo nickel was the direct result of die polishing and the removal of a leg. The 1970 Lincoln cent with the raised 7 is also the result of die polishing. Jefferson nickel with a die crack. Before 1990, all US coin dies were subject to mint mark errors resulting from the preparation of the dies. The mint mark was hammered into ...

  3. Errors, freaks, and oddities - Wikipedia

    en.wikipedia.org/wiki/Errors,_freaks,_and_oddities

    Color error: Stamp is printed in the wrong color(s). Paper error: Stamp is printed on the wrong type of paper which, e.g., may have a different watermark or color than intended. Perforation error: Perforations are missing on one or several sides or put in the wrong place (e.g. diagonally). As perforations may be removed by cutting them off ...

  4. Mint-made errors - Wikipedia

    en.wikipedia.org/wiki/Mint-made_errors

    Split planchet errors are normally restricted to planchets composed of a solid alloy, such as U.S. cents and nickels, [7] and the Australian fifty-cent coin. [6] Split planchet errors should not be confused with "separation errors", which only affect clad and plated coins.

  5. Nixon invert - Wikipedia

    en.wikipedia.org/wiki/Nixon_invert

    Christie's spokeswoman Laurie Dodge said that the stamp owner owned 160 of the misprinted stamps, but planned to auction a single stamp to gauge the market. [8] Inverted stamps are extremely rare, and so the claim of 160 stamps and the lack of information surrounding the discovery generated both interest and skepticism.

  6. United States Proof Set - Wikipedia

    en.wikipedia.org/wiki/United_States_Proof_Set

    The Silver Proof set became a standard product of the United States Mint in 1992, containing a dime, quarter, and half dollar composed of 90% silver. The compositions for the penny, nickel, and dollar (introduced to the set in 2000) remained the same as in the standard proof sets. [21] In 2019, the purity of the silver coins was changed to 99.9 ...

  7. List of United States commemorative coins and medals (1990s)

    en.wikipedia.org/wiki/List_of_United_States...

    1991 $1: Korean War Memorial dollar [5] Soldier Map of Korea and a bald eagle Ag 90%, Cu 10% Authorized: 1,000,000 (max) Uncirculated: 213,049 D Proof: 618,488 P 1991 $1: USO 50th Anniversary dollar [6] USO pennant and the words "50th Anniversary" Eagle on top of a globe Ag 90%, Cu 10% Authorized: 1,000,000 (max) Uncirculated: 124,958 D Proof ...

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