NGC

The Numismatic Guaranty Corporation (NGC) is a multinational coin grading service provider based in Sarasota, Florida. NGC is the world's largest third-party coin grading service by unit-volume having graded more than 30 million coins as of April 2014. It is the official grading service of the American Numismatic Association since 1995 and the official grading service of the Professional Numismatists Guild since 2004. NGC currently employs nearly 30 full-time graders.