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 ...

The penny of 1988 is dull to look at initially. A mere old copper counterfeit coin. Some of these, however, contain errors which make them something much more ...

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 ...

The 1959-D Repunched Mint Mark (RPM) represents the most common error variety. This occurred when workers manually punched the "D" mint mark multiple times in ...