A rare 2001-D Lincoln cent, a "mule error" coin with a dime reverse, has fetched over $100,000 at auction. This unique coin, created by a minting mistake in Denver, features Abraham Lincoln on the ...

A rare $1 coin with a distinctive “double rim”, the result of a printing error at the Mint back in 2000, is today worth an actual mint to collectors. According to ...

A mule in the animal kingdom is the result of mating a male donkey with a female horse, but a mule in the coin and currency world is the result of the pairing of two dies or printing plates that were ...

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 Lincoln pennies ...

A 'rare' 20p coin has sold for almost 200 times its shop value because of one subtle error. What's more, the Royal Mint suggest more are still to be found. The 2008 ...

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 Lincoln pennies ...

Like the leaning tower of Pisa, error coins demonstrate the alluring appeal of human error. Error coins account for some of the most rare and valuable collectable ...

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 ...