Old pennies that have been stamped twice during the minting process and have been circulated throughout the United States by accident have long been selling for thousands of dollars. In January 2023, ...

A childhood rhyme goes a little something like this: “Find a penny, pick it up, all day long you’ll have good luck!” But what if you found a penny, picked it up, and it was worth millions of dollars?

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 ...