The rarest and most expensive postage stamp in the world. It has been compared to Leonardo da Vinci's Mona Lisa.
The copy became unique due to a printing defect. The main batch of stamps was printed on green-colored paper, but Treskilling Yellow received yellow paper.
A boy was the first to discover the copy when he was looking through his late grandfather's correspondence. The treasure was sold in Stockholm for 7 guilders, after which the buyer immediately resold it to collectors at a markup of 6000%.
It is valuable because of a flaw: instead of the traditional Post Paid inscription, they bear a Post Office stamp.
The David Feldman auction house realized one of them for a million dollars.
Mauritius penny Post Office
First issued by the Grand Duchy of Baden in 1851. These stamps were usually printed on pink paper with a purple tint. However, a sheet of blue-green paper was accidentally included in the stack.
The mistake was noticed only after 44 years. In April 2008, one of them was sold at auction for 1.3 million euros.
Z Grill is a special way of making stamps - stamping with a stamp. It was used in the United States in 1860 to protect against illegal copying. This method was used for a short time and was canceled due to inefficiency.
The transaction was made in 1998, the estimated value amounted to $935 thousand.
Z Grill with Benjamin Franklin
- I wish my grandfather had one of those postage stamps....
A boy was the first to discover the copy when he was looking through his late grandfather's correspondence. The treasure was sold in Stockholm for 7 guilders, after which the buyer immediately resold it to collectors at a markup of 6000%.
The copy became unique due to a printing defect. The main batch of stamps was printed on green paper, but Treskilling Yellow received yellow paper.