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  2. Third-party grading - Wikipedia

    en.wikipedia.org/wiki/Third-party_grading

    Third-party grading (TPG) refers to coin grading & banknote grading authentication, attribution, and encapsulation by independent certification services.. These services will, for a tiered fee depending on the value of the coin, "slab" a coin and assign a grade of 1–70 on the Sheldon grading system, with 1 being the lowest grade, with only faint details visible to 70, a practically perfect ...

  3. Professional Coin Grading Service - Wikipedia

    en.wikipedia.org/wiki/Professional_Coin_Grading...

    Professional Coin Grading Service (PCGS) is an American third-party coin grading, authentication, attribution, and encapsulation service founded in 1985. The intent of its seven founding dealers, including the firm's former president David Hall, was to standardize grading.

  4. Numismatic Guaranty Company - Wikipedia

    en.wikipedia.org/wiki/Numismatic_Guaranty_Company

    Numismatic Guaranty Company (NGC) is an international third-party coin grading and certification service based in Sarasota, Florida. It has certified more than 60 million coins. NGC certification consists of authentication, grading, attribution, and encapsulation in clear plastic holders.

  5. Baseball Executive's $1 Million Cent Authenticated, Certified ...

    www.aol.com/news/2012-09-19-baseball-executives...

    Baseball Executive's $1 Million Cent Authenticated, Certified by Professional Coin Grading Service Division of Collectors Universe SANTA ANA, Calif.--(BUSINESS WIRE)-- A $1 million United States ...

  6. Collectors Universe - Wikipedia

    en.wikipedia.org/wiki/Collectors_Universe

    Collectors Universe Inc. is an American company formed in 1986, now based in Santa Ana, California, which provides third-party authentication and grading services to collectors, retail buyers and sellers of collectibles. Its authentication services focus on coins, trading cards, sports memorabilia, and autographs.

  7. According to the Numismatic Guaranty Company (NGC), the world’s largest rare coin authentication and grading service, a coin-making die is classified as “a cylindrical shaft of steel that ...