The old cliché about finding rare and valuable coins is that you should start by digging around in your couch cushions. That’s not necessarily bad advice. However, chances are the only loose change ...

The most expensive coin collection ever assembled numbers 15,000 coins—it’s so large and historically thorough that it’s being sold in a series of 15 auctions set to spread out over three years.

Collectors paid a pretty penny to get their hands to get the very last minted pennies. Stack's Bowers Galleries, a specialized coin auction site, said it sold 232 three-coin sets featuring some of the ...