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  2. US error coins - Wikipedia

    en.wikipedia.org/wiki/US_error_coins

    Below are photographs of two Brilliant Uncirculated Jefferson nickels. Note that these are variations of dies used to mint the 1970-D Jefferson nickels. The die variation is clearly evident with the placement of the D in two different locations, one closest to the 1970 and the other closest to the rim of the coin. [1]

  3. Mint-made errors - Wikipedia

    en.wikipedia.org/wiki/Mint-made_errors

    1937-D 3-legged Buffalo nickel; 1942/1 Mercury dime; 1942/1-D Mercury dime; 1943 copper cent; 1944 steel cent; 1955 doubled die obverse cent; 1958 handsome mule Franklin half dollar; 1970-S doubled die obverse cent with a small or large date; 1972 doubled die obverse cent; 1982 No P dime; 1983 doubled die reverse cent; 1984 doubled ear cent ...

  4. United States nickel mintage figures - Wikipedia

    en.wikipedia.org/wiki/United_States_nickel...

    Key dates for the series include the 1939-D, and 1950-D nickels. The 1939-D nickel with a mintage of 3,514,000 coins is the second lowest behind the 1950-D nickel. The cause of the key date of 1939 stems from the new design that excited collectors the year prior, after the initial hype had settled down fewer nickels were saved.

  5. Nickel (United States coin) - Wikipedia

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

    Violators of these rules can be punished with a fine of up to $10,000, five years imprisonment, or both. The rules were finalized on April 17, 2007. [113] [110] The melt value of a nickel for some time was more than five cents, including nearing over one-and-a-half times its face value in May 2007. Since then, the supply and demand of the coin ...

  6. Coin rotation paradox - Wikipedia

    en.wikipedia.org/wiki/Coin_rotation_paradox

    The outer coin makes two rotations rolling once around the inner coin. The path of a single point on the edge of the moving coin is a cardioid.. The coin rotation paradox is the counter-intuitive math problem that, when one coin is rolled around the rim of another coin of equal size, the moving coin completes not one but two full rotations after going all the way around the stationary coin ...

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    mail.aol.com

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  8. Coinage shapes - Wikipedia

    en.wikipedia.org/wiki/Coinage_shapes

    Some of these, such as the Netherlands zinc 5 cent coin of World War II (1941–1943) [4] and the Bangladesh 5 poisha coin (1977–1994) [5] are oriented as a square, while others, such as the Netherlands 5 cents (1913–1940), [6] the Netherlands Antilles 50 cent, the Bangladesh 5 poisha (1973–1974) [7] and the 1981 Jersey 1 pound coin, [8 ...

  9. Presidential dollar coins - Wikipedia

    en.wikipedia.org/wiki/Presidential_dollar_coins

    On March 8, 2007, the United States Mint announced, that on February 15, 2007, an unknown number of George Washington presidential $1 coins were released into circulation without their edge inscriptions (the U.S. mottos, "In God We Trust" and "E pluribus unum", the coin's mint mark, and its year of issuance; i.e. E PLURIBUS UNUM • IN GOD WE ...