What may be the most valuable object in the world has gone on show in London amid tight security.

It’s an 1855 Swedish postage stamp, called “Treskilling Yellow”, printed in the wrong color, and it’s worth £5million.

Weighing just 0.03 grams, the rare stamp is thought to be the most valuable thing in existence by weight and volume.

The three-shilling stamp was first issued in Sweden in 1855 and used in 1857 to mail a letter.

It was printed in yellow by mistake, and should in fact have been green, which has served to make it extremely rare.

It was presumed that some other stamps were produced in the same batch, but no other Treskilling Yellow has ever surfaced.

The stamp, on display at the Festival Of Stamps in Islington (in London), will be auctioned off in Geneva next week.

Source: Telegraph