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

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 ...

There used to be a saying — “pennies make dimes and dimes make dollars” — that stressed the importance of saving your money (the phrase later showed up in a country song). Today, some ...