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  2. Numismatic Guaranty Company - Wikipedia

    en.wikipedia.org/wiki/Numismatic_Guaranty_Company

    Since 2009, a scratch-resistant holder coating, similar to that used on eyeglass lenses, has been employed. NGC offers Oversize holders for coins larger than 45 mm and up to 120 mm, and Mega holders for coins larger than 120 mm and up to 180 mm. [12] NGC's label lists a coin's denomination, variety, grade, pedigree, serial number, and other info.

  3. Challenge coin - Wikipedia

    en.wikipedia.org/wiki/Challenge_coin

    The front of a U.S. Marine Corps birthday ball medallion Huguenot méreau used as a challenge coin during 17th century Protestant persecution in France. A challenge coin is a small coin or medallion, bearing an organization's insignia or emblem and carried by the organization's members. Traditionally, they might be given to prove membership ...

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

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

    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: George Washington Carver and Booker T ...

  5. Portal:Numismatics - Wikipedia

    en.wikipedia.org/wiki/Portal:Numismatics

    The gold coins were struck at the West Point Mint, the silver at the Philadelphia Mint and the base metal half dollars at the mints in Denver and San Francisco. All four coins have the same design. The obverse depicts a bootprint on the lunar surface, based on a photograph taken by Aldrin.

  6. Exonumia - Wikipedia

    en.wikipedia.org/wiki/Exonumia

    Exonumia are numismatic items (such as tokens, medals, or scrip) other than coins and paper money. This includes "Good For" tokens, badges, counterstamped coins, elongated coins, encased coins, souvenir medallions, tags, wooden nickels and other similar items. It is an aspect of numismatics and many coin collectors are also exonumists.

  7. Certified Acceptance Corporation - Wikipedia

    en.wikipedia.org/wiki/Certified_Acceptance...

    Coins that are solid or high-end for their grades will have a green, tamper-evident holographic sticker affixed to their holders. In the unusual event that a coin is found to be high-end for the next highest grade (or even finer), a gold sticker is affixed instead. [12] Coins deemed to be low-end, average, or over-graded receive no sticker at all.

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