Coins that have mistakes or unusual features can sometimes turn into highly valuable treasures. Over the years, I've come across stories of collectors who discovered ...

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 ...

Collectors really prize these coins because they show a unique minting mistake. Condition matters a lot here—well-preserved ones sell for much higher prices. I’ve seen some of these coins go for tens ...