The penny in question is called the 2001-D Lincoln cent mule error coin. It is so rare that it has twice sold at auction for ...

Wheat pennies with errors are among the most highly valued coins out there for any collector. The errors range from double-die casting to steel cent striking mistakes, all made by the U.S. Mint. The ...

These three rare pennies from over 20 years ago are now worth a fortune—find out which coins skyrocketed in value and why ...