The world's most expensive object by weight

At $8.3 million dollars for around 40 milligrams, the British Guiana 1c magenta is the world's most expensive object by weight: it's a postage stamp from 1856, the only one of its kind. More about the stamp and Stanley Gibbons: https://www.stanleygibbons.com/collecting-stamps/one-cent-magenta

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