The Inverted Jenny is one of the most famous and valuable postage stamps in the world. It is a United States postage stamp that was issued in 10 May 1918 , depicting a Curtiss JN-4 biplane, also known as the Jenny, flying upside down. The stamp was printed in blue and red ink and had a face value of 24 cents.
However, due to an error during printing, a small number of stamps were printed with the airplane flying the wrong way up, making them extremely rare and valuable. It is estimated that only 100 of these stamps were ever produced, making them highly sought after by collectors.
The Inverted Jenny stamp is named after its upside-down image of the biplane and has become a symbol of stamp collecting. In 2016, one of the few known Inverted Jenny stamps was sold at auction for over $1.3 million, making it one of the most expensive stamps ever sold.