Known as the world’s most valuable and rare stamp, this unique piece was produced during a stamp shortage in British Guiana. Only one copy is known to exist, discovered by a 12-year-old Scottish ...

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 ...

It's one of only two of its kind known to exist. The auction will mark the first time the rare stamp is up for sale in 26 years. It's rarity comes from what philatelists call a "Z-grill" Z-grill ...