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 ...

Numismatics, or coin collecting, has been a popular pastime in the United States (and many other countries) for more than two hundred years. In order to understand the hobby, the novice collector must ...

CoinKnow provides comprehensive valuations using recent auction data from Heritage Auctions and Stack's Bowers, updated monthly. Coinoscope's value estimates are vague and unreliable, often varying ...