The 10 most valuable stamps in the world are, almost without exception, mistakes: an aeroplane printed upside down, a colour swapped for the wrong denomination, a plate laid the wrong way round. A printing error only becomes one of the world’s most valuable stamps through survival, since a clerk’s slip in 1855 or 1918 is worth millions only once every other faulty sheet has been destroyed or used to post a letter.
Billions of ordinary stamps are printed and franked every year, worth exactly their face value decades on. The stamps below are the opposite case: single sheets, single covers, in two instances a single surviving specimen, each traceable through dated auction catalogues. A modern souvenir reprint carries none of that paper trail, or the price.
Prices for these rarities have climbed steadily at the handful of specialist houses that handle them, and a new record for a single postage stamp has been set roughly once a decade since the 1980s. Below are the ten most valuable stamps and postal covers to have realised a documented price at auction, ranked by price in sterling.
Discover all in our:
The 10 most valuable stamps in the world, ranked
1. British Guiana 1c Magenta (£5.6 million)
The only surviving example of a stamp printed in a hurry by Georgetown’s post office in 1856, after a shipment of British-printed stamps failed to arrive. Shoe designer Stuart Weitzman bought it at Sotheby’s, New York, on 17 June 2014 for $9,480,000, the highest price paid for a single stamp.
Credit: Public domain via Wikimedia Commons
2. 1c Benjamin Franklin Z Grill (£3.4 million)
One of only two surviving examples of a stamp embossed with a fine waffle pattern, called a grill, meant to stop used stamps being washed and reused. Formerly owned by bond investor Bill Gross, it sold at Robert A. Siegel Auction Galleries on 14 June 2024 for $4,366,000, the highest price paid for a single US stamp.
Credit: National Bank Note Company, public domain via Wikimedia Commons
3. Inverted Jenny, finest known single (£1.6 million)
Part of the only sheet of 100 airmail stamps ever printed with its biplane upside down, a printer’s error from May 1918. Robert A. Siegel Auction Galleries sold this example, the highest graded of the survivors, on 8 November 2023 for $2,006,000 with premium.
Credit: Bureau of Engraving and Printing, public domain via Wikimedia Commons
4. Inverted Jenny plate block of four (£1.5 million)
A block of four Inverted Jennys, still joined as printed rather than separated into singles, and the only such block never broken up. Robert A. Siegel Auction Galleries sold it on 19 October 2005 for a hammer price of $2.7 million.
Credit: Public domain via Wikimedia Commons
5. Hawaiian 2c Missionary cover, “The Dawson Cover” (£1.4 million)
The only known cover to carry both the 2c and 5c Hawaiian Missionary stamps of 1851, named after its recipient, Eliza Dawson, whose brother in Honolulu addressed it to her. Robert A. Siegel Auction Galleries sold it on 25 June 2013 for $2.24 million with premium.
Credit: Public domain via Wikimedia Commons
6. Mauritius “Post Office” 2d Blue (£1.08 million)
One of roughly 26 survivors from Mauritius’s first stamp issue of 1847, scarce after the engraver mistakenly lettered them “Post Office” rather than “Post Paid”. Spink sold this example in 2011, from the Chartwell Collection, for £1.08 million, still the most expensive stamp sold at a British saleroom.
Credit: J.O. Barnard, public domain via Wikimedia Commons
7. Xiphopagus Triplet (£974,000)
A strip of three of Brazil’s first stamps, the 1843 Bull’s Eyes, with two denominations left joined after the printing plate was engraved incorrectly. Known as the Pack Strip after a former owner, it sold at Robert A. Siegel Auction Galleries on 5 June 2008 for $1,900,000.
Credit: Government of Brazil, public domain via Wikimedia Commons
8. Baden 9 Kreuzer error (£742,000)
A stamp from the German state of Baden, printed in green rather than the pink reserved for its 9 Kreuzer denomination, after a printer reached for the neighbouring 6 Kreuzer plate by mistake. Only four examples survive, and this one sold at David Feldman, Geneva, on 3 April 2008 for $1,471,500.
Credit: Andrei Sdobnikov, public domain via Wikimedia Commons
9. 3c Washington B Grill (£659,000)
One of just four known examples of a 3c stamp bearing an early experimental grill, identifiable by its large, widely spaced points. Robert A. Siegel Auction Galleries sold it on 29 October 2008 for $1,035,000 with premium.
Credit: National Postal Museum
10. China Empress Dowager surcharge invert (£601,000)
A 19th century Chinese revenue stamp overprinted for postal use in 1897, its new value printed upside down. Only three examples are verified, and Spink sold the sole unused one in Hong Kong on 18 January 2019 for a hammer price of HK$6,100,000, a record for the Empress Dowager issues.
Credit: Canadian Stamp News
Why a printing mistake outsells the stamp it was meant to be
Seven of the ten items above exist because someone at a print works made a mistake: a wrong colour, a plate laid the wrong way round, a value printed upside down. None were rare at the time; printers destroyed most faulty sheets before they reached a post office counter. What is rare is that a handful escaped, changed hands for a few cents, and survived to be authenticated a century later.
Six of the ten sales went through a single New York firm, Robert A. Siegel Auction Galleries, a measure of how concentrated this market has become. Prices there rose from a $2.7 million hammer for the Inverted Jenny plate block in 2005 to $4,366,000 for the Z Grill in 2024. Its value rests on how few others survived.
