GENEVA — The Swedish “Treskilling Yellow” retained its title as the world’s most expensive stamp when it changed hands at a private sale, the auctioneer said Saturday.

The price, which Sotheby's notes is nearly 1 billion times the stamp's original face value, obliterates the previous single-stamp record: the 1855 Swedish "Treskilling Yellow," which sold for ...

GENEVA — The Swedish “Treskilling Yellow” retained its title as the world’s most expensive stamp when it changed hands at a private sale shrouded in secrecy, the auctioneer said Saturday ...

By 2011, most first-class stamps in the U.S. had become so-called Forever Stamps. They can always be used to mail a 1-ounce letter, no matter how much prices might increase in the future. Your Money ...

Stamps are about to get more expensive: ... Mailing prices most recently rose in January when the United States Postal Service increased the costs of some postage by more than 4%.

The British Guiana One-Cent Black on Magenta begins its journey in a young Scottish boy's collection and passes through the hands of a delusional killer. It was auctioned Tuesday for $9.5 million.