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  2. US error coins - Wikipedia

    en.wikipedia.org/wiki/US_error_coins

    Variations are not mint errors in the technical sense. Variations in coins are caused by creating hubs and dies that are not exactly the same resulting in dates that can be compared as large to small, wide to thin etc.

  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. The 1972 Doubled Die cent is worth a pretty penny,” said Pearlman, sharing that the Numismatic Guaranty Company Price Guide “estimates the current retail value at $175 in Extremely Fine ...

  5. Glossary of numismatics - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_numismatics

    Precious metals in the form of coins whose market value is determined by metallic content rather than scarcity. bullion value The current market value of the raw precious metal content of a coin. For example, the bullion value for Canadian silver coins minted between 1920 and 1966 is 12 times the face value when silver is $20.00 per troy ounce.

  6. 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.

  7. Sheldon coin grading scale - Wikipedia

    en.wikipedia.org/wiki/Sheldon_coin_grading_scale

    (Courtesy of the National Numismatic Collection, National Museum of American History [photograph by Jaclyn Nash].) The Sheldon Coin Grading Scale is a 70-point coin grading scale used in the numismatic assessment of a coin's quality. The American Numismatic Association based its Official ANA Grading Standards in large part on the Sheldon scale. [1]