An old British stamp from the island of Mauritius is worth millions now -- due to both its royalty and use in a high-class ...

The "Inverted Jenny," 1918, one of the rarest and most valuable stamps in the world, celebrates the first air mail in the U.S.—by depicting an inadvertently upside-down airplane. Hannah Whitaker ...

Mintage World has launched "Endangered Parrots of the World on Stamps, Coins and Banknotes," a coffee table book showcasing ...