Usually when you hear about an item purchased for $2.3 Million, you expect it to be something like a grandiose house, or maybe a heavily modified car, you surely don’t think of a stamp that was printed in Sweden, in the year 1855.

But that’s not the only surprising thing about the most expensive stamp in the world named Treskilling Yellow - The stamp samples are actually a result of an unnoticed mistake in stamp-printers and were later discounted in 1858.

The question of how many stamps of this kind have been printed remains unanswered, but only 1 copy is known to exist, which was sold for $2.3 Million in 1996, a whopping $71 Billion per kilogram.

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