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

These coins that are still in circulation have been minted using the wrong materials, making them valuable to collectors ...

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 ...