The "Inverted Jenny" stamp, celebrated for its depiction of an accidentally upside-down airplane, is one of the world's rarest and most valuable stamps. Originating from a 1918 issue to commemorate the first U.S. Air Mail, its history is as intriguing as its design.

The Penny Black holds a special place in history as the world's first adhesive postage stamp used in a public postal system. Issued in the United Kingdom in 1840, it revolutionized the postal service and laid the groundwork for modern global communication.