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Definition: NGC stands for "Numismatic Guaranty Corporation." NGC is one of the two widely-recognized "top tier" grading services, the other being PCGS.

See also:
What is a coin grading service?
What is coin grading?

On the Web:
Visit the NGC Web site.
Personally, I prefer NGC over PCGS, but they're both equally recognized as the top-notch services for coin grading.

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