A rare Benjamin Franklin Z-grill stamp from 1868 could fetch as much as $5 million once it hits auction in New York. There are only two known stamps in existence.

The first stamp was created in Great Britain on May 1, 1840. It wouldn't take long for people to start collecting them. Just one year later, a woman placed an ad in the London Times seeking ...

A famous invert error stamp has sold for well over its estimate at a New York sale. Discover the upside-down 1c Pan-American ...