Rare “Inverted Jenny” stamp sells for $1.3 million

The Inverted Jenny, one of the rarest stamps in the world, sold for more than 1.3 millions U.S. dollars on the World Stamp Show in New York.
In 1918, the U.S. Post Office printed a number of stamps that depicted a Curtiss JN-4 airplane, but 100 of them were printed with the plane flying upside down.