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  2. US error coins - Wikipedia

    en.wikipedia.org/wiki/US_error_coins

    The AM letters are either touching or are distinctly apart in some Lincoln cents minted in 1998, 1999, 2000, and perhaps others to be discovered. Normally, the wide AM design is reserved for the Lincoln proof designs. Below is a photograph of a wide AM Lincoln cent. 1970-D Jefferson nickel High D 1970-D Jefferson nickel Low D Lincoln Cent Wide ...

  3. Mint-made errors - Wikipedia

    en.wikipedia.org/wiki/Mint-made_errors

    In addition, errors are often not noted by grading services. Overdates, mules, brockage, double denomination, and struck on the wrong planchet errors are often valuable. Errors on ancient, medieval, and higher-value coins, however, may be detrimental to the coin's numismatic value.

  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

    This "cleanliness" is a result of the surface of the coin being dissolved by the acid. Dipped coins almost always have a lower numismatic value than when they were in their former "dirty" state, hence most numismatists do not recommend dipping or any other method of cleaning coins as doing so will likely reduce the coin's value. Double Eagle (U ...

  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. Q. David Bowers - Wikipedia

    en.wikipedia.org/wiki/Q._David_Bowers

    The first coin Bowers ever ordered through the mail was an Indian cent, an 1859 proof at a price of $11 from the Copley Coin Company run by Maurice Gould and Frank Washburn in Boston. [2] His enthusiasm for the Numismatist Scrapbook Magazine also resulted in an accumulation of back copies dating to 1935, and a file of several decades of The ...