To improve grading accuracy and consistency, professional grading services like PCGS (Professional Coin Grading Service) and NGC (Numismatic Guaranty Corporation) employ trained graders and utilize a ...
In the U.S., two main organizations, the Professional Coin Grading Service (PCGS) and Numismatic Guaranty Corporation (NGC), evaluate coins using the Sheldon Scale to assign a numerical rating, from 1 ...