A single penny struck at the Philadelphia Mint in 1955 remains one of the most sought-after error coins in American numismatics, and examples still surface outside of dealer inventories. The 1955 ...

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 ...

Most people treat spare change and crumpled bills as an afterthought, something to toss in a jar or hand over without a second glance. Yet mixed into that ordinary cash economy are a handful of coins ...