Left: This mismade 1958 penny with severe doubling in the lettering was sold for a record $1.136 million by GreatCollections, a coin auctioneer in California. Right: CoinHub founder shows where coin ...

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?