What is the oldest stamp?

Before the use of adhesive paper stamps, letters were hand stamped or postmarked with ink. Postmarks were the invention of Henry Bishop and were at first called 'Bishop mark' after the inventor. Bishop marks were first used in 1661 at the London General Post Office. They marked the day and month the letter was mailed.

The first issued postage stamp began with Great Britain's Penny Post. On May 6, 1840, the British Penny Black stamp was released. The Penny Black was engraved the profile of Queen Victoria's head, who remained on all British stamps for the next sixty years. Rowland Hill created the first stamp.