Grading Services Rated in PNG Survey
May 20, 2022
2 minutes
By Richard Giedroyc
■ It is my understanding that the top two third-party certification services are Professional Coin Grading Service (PCGS) and Numismatic Guaranty Company (NGC). How did this evolve?
In 2007, the Professional Numismatists Guild surveyed major coin dealers for their opinion of 11 services that existed at
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