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
I’m at https://tomscott.com
on Twitter at https://twitter.com/tomscott
on Facebook at https://facebook.com/tomscott
and on Instagram as tomscottgo