In 1878, the U.S. Mint experimented with producing a thinner, wider quarter eagle—a $2.50 gold coin—but later abandoned the idea. Now, more than 140 years later, a copy produced at the time has ...

It's easy to overlook spare change, especially when you're focused on retirement savings or rising grocery bills. But some ordinary-looking coins tucked away in drawers, old purses, or inherited ...