Inverted Dendermonde -The Inverted Dendermonde, which shows the town hall upside down, is Belgium’s best contribution to the printing errors. Although this error leaked through two sheets of the stamp’s first run and one pane of the second, just 17 are known to still exist. It is rumored that two of these stamps were lost when a well-known stamp collector was murdered in ‘42. If you wanted to get your hands on one, you will be set back an estimated €75,000.
Inverted Jenny – Another printing error is what placed the big price tag on the Inverted Jenny. Worth around €750,000, this stamp has an upside-down image of the Curtiss JN-4 airplane and was distributed in the US in ‘18. Only 100 copies got to make it through printing, which is why the Inverted Jenny is priced so highly.
Baden 9 Kreuzer – Rather than being valuable for an image error, the Baden 9-Kreuzer is a moneymaker because of a color error. A 9-Kreuzer stamp has the face value of 9-Kreuzer and is colored pink, whilst the 6-Kreuzer stamps were green. Though, an error in printing meant that a batch of 9-Kreuzer stamps were colored green, instead of pink. Only a few exist and one was sold in 2008 for more than €1 million.
The First Two Mauritius – Issued in 1847 in Mauritius during the British Colony, these stamps were modelled on the British stamps with an appearance of Queen Victoria. With just 26 copies known to still exist, it is no wonder that this stamp hold a value of over €1 million.
The Treskilling Yellow – The Treskilling Yellow is thought to be one of the most expensive postage stamps on earth due to the fact it should be printed in a blue-green color with the three-skilling print, but it was printed in yellow. This Swedish misprinted stamp issued in 1855 is deemed to be the only surviving copy to exist, which is why it is worth over €2.1 million.