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  2. Coin cleaning - Wikipedia

    en.wikipedia.org/wiki/Coin_cleaning

    According to Q. David Bowers, collectors and coin dealers cleaned and dipped their coins then re-dipped them when the toning re-appeared as a result of these messages. [3] Bowers estimated in 1960 that 90 to 95% of the Lincoln cents sold in the marketplace dated 1910 through the late 1920s were brilliant as a result of dipping. [4]

  3. Certified Guaranty Company - Wikipedia

    en.wikipedia.org/wiki/Certified_Guaranty_Company

    For example, an otherwise "near mint" condition book with a 4-inch back cover tear would be given a Qualified grade of "9.0, back cover 4-inch tear." Signature Series (yellow) A book signed by someone of significance to the comic, as witnessed by an employee of CGC, and the signature certified as authentic. Signature Series Restored (yellow/purple)

  4. Numismatic Guaranty Company - Wikipedia

    en.wikipedia.org/wiki/Numismatic_Guaranty_Company

    NGC Cert Lookup verifies all NGC-certified coins and helps combat holder counterfeiting. Using the label serial number, NGC will reveal a coin's date, denomination, grade, photo (if any), and pricing and Census info. NGC Coin Explorer lists key info about many coin issues, such as mintages and values. [15]

  5. Glossary of numismatics - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_numismatics

    A coin issued in the United States worth $0.10 (ten cents). While the term dime is American in origin, Canadians often use the term as well. dipping The chemical cleaning of a coin with a diluted acid. This "cleanliness" is a result of the surface of the coin being dissolved by the acid.

  6. Coin collecting - Wikipedia

    en.wikipedia.org/wiki/Coin_collecting

    Some coin collectors are generalists and accumulate examples from a broad variety of historical or geographically significant coins, [16] but most collectors focus on a narrower, specialist interest. For example, some collectors focus on coins based on a common theme, such as coins from a country (often the collector's own), [ 17 ] a coin each ...

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