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 ...

As with just about any asset, a coin’s value is determined by its market demand. This means that coins in short supply often see higher demand — and higher values. With coins, supplies are limited ...

Wheat pennies with errors are among the most highly valued coins out there for any collector. The errors range from double-die casting to steel cent striking mistakes, all made by the U.S. Mint. The ...