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  2. US error coins - Wikipedia

    en.wikipedia.org/wiki/US_error_coins

    The result of preparing a set of new dies improperly from the original hub results in coin errors such as doubling, extra details, or missing details on the surface of the coin. A die break is caused when the mint die suffers a crack and this crack feature is transposed onto the coins in the minting process.

  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. One of the most famous Doubled Die cent errors occurred in 1955, according to the Numismatic Guaranty Company. Today, these mistakenly-made pennies have a retail value ranging from $1,000 to ...

  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-deterioration doubling - Wikipedia

    en.wikipedia.org/wiki/Die-deterioration_doubling

    In modern presses, a die strikes approximately 120 coins a minute. This is a large number of coins produced in a short time, and obviously the die cannot last forever. However, the process of wearing the die is only hastened by the metals used in coins. Nickel, one of the main metals used in today’s coins, is quite hard and causes wear ...

  7. A Guide Book of United States Coins - Wikipedia

    en.wikipedia.org/wiki/A_Guide_Book_of_United...

    Delayed until the end of World War II, the Red Book was published in 1946, providing collectors even more historical information as well as retail values (prices collectors could expect to pay coin dealers to buy coins) instead of wholesale values. R. S. Yeoman served as editor of the Red Book and Blue Book until he retired in 1970.

  8. List of United States commemorative coins and medals (1950s)

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

    Face value Coin Obverse design Reverse design Composition Mintage Available Obverse Reverse 50¢ Booker T. Washington Memorial half dollar Booker T. Washington Hall of Fame for Great Americans and a log cabin 90% Ag, 10% Cu Uncirculated: 510,082 (P) 12,004 D 12,004 S [2] 1951 50¢ Carver-Washington half dollar

  9. 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.