the most expensive stamp in the world is in London, England. A tiny "treskilling yellow" stamp, weighing only 0.03 g, was first issued in Sweden in 1855 and was first used in 1857. Now it is worth US $7400000, the most expensive stamp in the world.
The normal 3-shilling stamp should be green at that time, but this stamp was misprinted in yellow, which is the color of the 8-shilling stamp at that time. David Feldman, the auctioneer, said the buyer's name, identity and the final price of the stamp would be kept secret. However, he revealed that the stamp still holds the record of the most expensive stamp in the world. In 1996, the stamp was auctioned at a high price of CHF 2.875 million (£ 1.728 million). It was noted that the stamp was valued at up to £ 5 million. The stamp was almost lost. Fortunately, a little Swedish boy found it and exchanged it for some change. Since then, the stamps have changed hands several times. Several philatelists, German nobles and Belgian tycoons were all its owners. In a statement, the auction house said a consortium member believed that the stamp was still a solid investment worth making in the economic crisis, so he paid for it.