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  2. 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).

  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. Die defect - Wikipedia

    en.wikipedia.org/wiki/Die_defect

    A die crack occurs when a die, after being subjected to immense pressure during the minting process, cracks, causing a small gap in the die. [3] If this damaged die continues to produce coins, the metal will fill into the crack, thus revealing a raised line of metal in the finished coin.

  5. “The most famous doubled die cent is the 1955 Lincoln cent with the doubling error,” explained Pearlman. “There also are some more recent examples that possibly could be found in pocket ...

  6. Withdrawal of low-denomination coins - Wikipedia

    en.wikipedia.org/wiki/Withdrawal_of_low...

    Half farthing (1 ⁄ 8 d) farthing (1 ⁄ 4 d) ha'penny (1 ⁄ 2 d, 1 ⁄ 480 £) 1 ⁄ 2 penny (1 ⁄ 200 £) 1856 [29] 1956 1967 1983: 1870 1960 1969 31 December 1984: No [2] Decimal halfpennies can be paid into bank accounts at the discretion of commercial banks; cannot be exchanged by the general public at the Royal Mint, although private ...

  7. Die-deterioration doubling - Wikipedia

    en.wikipedia.org/wiki/Die-deterioration_doubling

    Die deterioration doubling is a result of a few simple causes, but it can be difficult to positively identify. There are a number of different features which appear similar, but the characteristic traits of each are easy to identify with practice.

  8. 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.

  9. 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