Known as the world’s most valuable and rare stamp ... With only two examples known to exist, one of these stamps sold for a staggering $4.3 million at auction. But if you don’t have $4 ...

A rare 1897 10 cents-on-9-Candareen dark green Dragons ... The famed Treskilling Yellow is a misprinted three-skillings Swedish stamp produced in 1855. The stamp was supposed to be colored green ...