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?

That’s a lot of coin. A Lincoln wheat penny minted in 1955 sold this month for $2,050 on eBay because it contains a rare feature known as a “double die error ...

You don’t need to be a seasoned collector or visit a coin shop to stumble upon valuable U.S. coins—some rare and sought-after pieces still show up in everyday pocket change. From minting errors to low ...

Often in coin collecting what makes an item valuable is not that it’s perfect, it’s that something went wrong in the minting process, making the resulting coin rare, and hence highly collectible. That ...