The Economic Times

Million dollar mistake: A 24-cent stamp became one of Americas rarest due to a printing error. It turned the stamp into a collectors prize worth $2 million

The 1918 Inverted Jenny stamp was originally sold for just 24 cents, but a printing mistake left the Curtiss JN-4 airplane upside down. Only 100 such stamps reached the public, turning them into prized collectibles. More than a century later, one rare example sold for $2.006 million at a New York auction.