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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. 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.

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. If You Find a Rare ‘Doubled Die’ Penny, It Could Be Worth $1. ...

   www.aol.com/finance/rare-doubled-die-penny-could...

   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 ...

7. 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.

8. Coin grading - Wikipedia

   en.wikipedia.org/wiki/Coin_grading

   Coin grading [1] is the process of determining the grade or condition of a coin, one of the key factors in determining its collectible value. A coin's grade is generally determined by six criteria: strike, preservation, luster, color, attractiveness, and occasionally the country/state in which it was minted.

9. ANACS (coin grading company) - Wikipedia

   en.wikipedia.org/wiki/ANACS_(coin_grading_company)

   Originally founded in June 1972 as the American Numismatic Association's authentication service, ANACS expanded into third-party coin grading in March 1979. ANACS was founded in response to the rise in counterfeit and altered coins in the numismatic marketplace. During the coin collecting boom of the 1960s, counterfeiters would alter common ...