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2. Coin grading - Wikipedia

   en.wikipedia.org/wiki/Coin_grading

   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.

3. Sheldon coin grading scale - Wikipedia

   en.wikipedia.org/wiki/Sheldon_coin_grading_scale

   Proof coins. Like circulated grades, proof coins are graded on the Sheldon scale from 1 to 70, and are preceded by the abbreviation ‘PF’ or ‘PR’ to distinguish them from circulation strikes. Proof coins graded 60 to 70 are mirrored to those of Uncirculated grades with the difference that the coin was not made for circulation.

4. 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][5] The firm has divisions in Europe and Asia, and is owned by parent ...

5. 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. NGC is a subsidiary of Certified Collectibles Group (CCG ...

6. Certified Acceptance Corporation - Wikipedia

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

   Grading standards have changed over the years. Because collectors and dealers have gotten more selective, an informal "sub-grade" system has evolved. "A" coins are the best of the grade, "B" coins are "solid", and "C" coins are at the low end of a particular grade based on the Sheldon scale, e.g., MS-65. CAC stickers are intended to standardize ...

7. 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 ...