5. Inverted Head 4 Annas
Issued in 1854, having an inverted head printed upon, this stamp has a face value of 4 Annas (0.00256 USD). This stamp is a collector’s item. Only 30 of them exist on the present day. An invert error occurred during the printing of this stamp and that is the reason it has an inverted head printed upon the face of it, hence the name of the stamp. This stamp was made in Calcutta and is one of the first multicolored stamps. (Basel Dove precedes it by 9 years).
4. Treskilling Yellow
The Treskilling Yellow was made in 1855. This is a postage stamp of Sweden. The unique thing about this stamp is that there is only one copy of the stamp that exists on present day. Due to this the current value of this stamp can be said to be the most among all right now. It holds the world record for the auction sale price of single postage stamp. Last sold in 1996, US $ 2,060,000 was the price.
3. British Guiana 1c magenta
Like the Treskilling Yellow, The British Guiana 1c magenta has also only one piece that exists in the present day. Last sold in 1980, the price was US$935,000. This postage stamp is rated by many philatelists as the world’s most famous stamp. It was issued in 1856 by the British Guiana which is now known as Guyana.
2. Uganda Cowries
The only stamp that includes in our list that was made not in a press rather was made on a typewriter. Since there were no press in the Uganda, typewriters were the only way out. This stamp is also very rare in nature and only one of it exists today. The face value of this stamp is 50 cowries. This stamp was first made in 1895
1. Inverted Jenny
The inverted Jenny is also known as the Upside Down Jenny or Jenny Invert. It is a US stamp that was issued in 1918. The face value of the stamp is 24 cents. It also had an invert error and the image of Curtiss JN-4 air plane was printed inverted due to an error. Only 100 of these stamps were printed. In 2007 one of the stamps was sold for $825,000. Reports also say that a block of 4 such stamps were sold for $2.7 million.