Some of the rarest and most valuable coins in U.S. history owe their worth to minting errors that slipped through unnoticed. Coins like the 1943 Copper Penny, struck in copper instead of wartime ...

As with just about any asset, a coin's value is determined by its market demand. This means that coins in short supply often ...

Morgan dollar recently sold by Stack's Bowers Galleries displayed a pair of error types that helped drive the final selling ...