The error coin market has exploded in ways that would make even seasoned collectors' heads spin. What started as casual treasure hunting through pocket change has evolved into something that resembles ...

Minting coins isn't exactly an exact science. Even though most coins are perfect and uniform, small mistakes can result in error coins that are super valuable and ...

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 steel ...