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 ...
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Coin collectors’ guide to mastering grading scales
Coin grading isn’t just for experts—it’s the backbone of understanding a coin’s true value. From the Sheldon Scale to PCGS and NGC’s market influence, knowing the grading process can mean the ...
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 ...
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