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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.
Certified Acceptance Corporation (CAC) is a Far Hills, New Jersey third-party coin certification company started in 2007 by coin dealer John Albanese. The firm evaluates certain numismatically valuable U.S. coins already certified by Numismatic Guaranty Corporation (NGC) or Professional Coin Grading Service (PCGS).
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.
During the coin collecting boom of the 1960s, counterfeiters would alter common-date coins, and either add or remove a mintmark in order to sell the coins as their more-valuable counterparts. (For example, an 'S' mint mark would be added to a 1909 VDB Lincoln cent in order to increase the coin's value by making collectors think it was a genuine ...
The silver versions of the coins are extremely rare and only two are known to exist, according to the Professional Coin Grading Service, a rare coin grading company. About 20 pewter continental ...
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. Several grading systems have been ...