In 1918, a Washington clerk spent $24 on 100 stamps during his lunch break. Every plane was upside down, one later sold for $2 million

A Washington clerk bought a sheet of stamps with an upside-down airplane design. This rare error, the Inverted Jenny, was later sold for a significant profit. Colonel Edward Green divided the sheet into individual stamps for distribution among friends. One stamp remained in a bank vault for a century before selling for over two million dollars. The Inverted Jenny's value stems from its unique printing mistake and fortunate discovery.