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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

    Like other coins, the value of errors is based in part on rarity and condition. In general, lower denomination errors are less expensive than higher denomination errors simply because more such coins are minted resulting in available errors. Due to improvements in production and inspection, modern errors are more rare and this impacts value. [3]

  4. Washington quarter mintage figures - Wikipedia

    en.wikipedia.org/wiki/Washington_quarter_mintage...

    Bicentennial reverse, 1976 (Nickel-clad copper unless otherwise noted) Year Mint Mintage [14] Comments 1976 (P) 809,784,016 Struck in 1975 and 1976

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  6. Die-deterioration doubling - Wikipedia

    en.wikipedia.org/wiki/Die-deterioration_doubling

    With a metal such as nickel, which is harder than a normal coin metal like silver, gold or copper, the pressure must be greater. When a nickel coin, or any coin, is struck, the metal must "flow" into the contours of the front and back dies. It is through the atoms of the metal flowing into the dies that flow lines are created.

  7. 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.

  8. Circular error probable - Wikipedia

    en.wikipedia.org/wiki/Circular_error_probable

    The relation between and are given by the following table, where the values for DRMS and 2DRMS (twice the distance root mean square) are specific to the Rayleigh distribution and are found numerically, while the CEP, R95 (95% radius) and R99.7 (99.7% radius) values are defined based on the 68–95–99.7 rule

  9. United States quarter mintage figures - Wikipedia

    en.wikipedia.org/wiki/United_States_quarter...

    Below are the mintage figures for the United States quarter up to 1930, before the Washington quarter design was introduced.. The following mint marks indicate which mint the coin was made at (parentheses indicate a lack of a mint mark):