A new postage stamp error has been discovered at a UK private philatelic auction.
The rare sheet of 20 1982 British Motor Cars 19½p postage stamps has a previously-unknown "double grey" printing error.
In the end, the stamps sold for £10,925 at an auction held by philatelic dealer Stanley Gibbons. This price was nearly a thousand times the stamp's original value.
The sheet includes 12 stamps each affected by the double printing error, described as "a stunning visual error" by the auctioneer.
The 1982 British Motor Cars 19½p postage stamp sheet is only the latest in a long line of valuable error stamps which celebrate travel - the most famous being the Inverted Jenny, aka the 1918 24c carmine rose and blue.
With its iconic error-printed 'upside down' bi-plane, the Inverted Jenny is otherwise known as "America's most famous stamp" whose public appearances have included a cameo in an episode of The Simpsons.
Other error-printed travel stamps which have cropped-up on the markets include this 1966 British technology series of postage stamps.
Their design features Queen Elizabeth II's profile, alongside three quintessentially British automobiles including the iconic Mini Cooper.
Yet there is a glaring omission: a larger-scale blue Jaguar E-Type, which ought to be hovering about the Mini, is missing.
The 1966 error stamp sold in fine, unmounted and mint-quality for £40,000 ($63,830 - including VAT and buyer's premium) at an auction held by Grosvenor in November 2010.