Usually when errors happen during the production process, they lead to a decrease in value of the manufactured item. But when they happen at the U.S. Mint, they could lead to an item ballooning in ...

4. The 1982 Bronze Lincoln Penny Now, here's a fun fact: in 1982, the U.S. Mint switched from bronze to zinc for Lincoln pennies. But, surprise! Some bronze pennies were still minted, and they're like ...