World’s Most Expensive Stamp, Valued at $12M, on Display in Prague

The Czech capital Prague is hosting an unprecedented exhibition of the world’s rarest postage stamp—the 1856 British Guiana “One-Cent Magenta”—in the first event of its kind held in the country. The stamp, issued on the northern coast of South America in what was then British Guiana, forms the centerpiece of the exhibition “Treasures of World Philately.”

Record valuation and historic context

Appraisers have placed the value of the “One-Cent Magenta” at more than 250 million Czech crowns—approximately $12 million—making it the most expensive stamp ever offered for public viewing. Its issuance date, 1856, predates the widespread adoption of standardized postal systems across colonial territories, contributing to its extreme scarcity.

Also featured in the exhibition are other globally renowned philatelic rarities: the iconic U.S. “Inverted Jenny” stamp and a strip of twelve “Penny Black” stamps from the United Kingdom’s 1840 issue—the world’s first adhesive postage stamp.

Total exhibit value and public access

Organizers report that the aggregate market value of all items on display approaches one billion Czech crowns. The exhibition draws stamp collectors from countries worldwide and runs through 6 September at Prague City Hall.