Les Perelman, a researcher at the Massachusetts Institute of Technology, has been doing some interesting experiments to test the capacity of computerized grading systems to accurately judge the ...

Coin grading secrets every collector should know Coin grading isn’t just a technicality—it’s the language of trust and value in numismatics. From the Sheldon 70-point scale to authentication methods, ...

GRAND RAPIDS, MI - A Grand Rapids-based inventor has developed a first-of-its-kind device designed to transform how collectors grade and value their coins. The OCS200, created by Richard Colonna of ...

Coin grading is the process by which a certified numismatist determines the grade, or physical condition, of an existing coin. Once the grade is determined, the value of the coin can then be ...