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Numismatic Guaranty Corporation
The Numismatic Guaranty Corporation (NGC) is a privately owned, international coin certification service based in Sarasota, Florida. It is the world's largest third-party coin certification service by volume, having certified more than 32 million coins. NGC certification consists of grading, authenticating, attributing, and encapsulating coins in clear plastic holders. NGC has been the official grading service of the American Numismatic Associationsince 1995 and the Professional Numismatists Guild since 2004. The service currently employs nearly 30 full-time graders.
==Overview==
Coins or other numismatic items can be submitted to NGC for certification, which consists of authentication, grading, attribution, and encapsulation in sonically-sealed plastic holders (aka slabs). A paper insert lists the date, grade, variety, and other key information. A 70-point Sheldon coin grading scale is used. Cleaned, scratched, or otherwise impaired items are encapsulated and assigned a verbal "details" grade, but not a numerical one. Certification fees vary depending on several factors, such as turnaround time and a given coin's value. NGC has certified over 32 million coins.
Certification offers significant protection against counterfeiting and over grading, but does not definitively guarantee what a numismatic item's value is. Even within the same grade, different coins can have widely differing values. NGC guarantees the accuracy of its grading: compensation will be given for coins which NGC regrades lower. NGC's Census Report reveals how many examples of each coin issue NGC has certified in each grade, which helps to determine rarity levels.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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