World's most expensive stamp sells at New York auction

It's a piece of paper just an inch square - but this nineteenth-century stamp from British Guiana has just sold at Sotheby's in New York for over $9 million at auction - the highest price ever paid for a stamp.

The stamp, which portrays a three-masted ship on a magenta background, along with the colony's motto, "We give and expect in return", is as rare as a stamp can get.

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