Lateral Thinking Puzzles

5. The Mystery of the Penny Black

5. The famous 'Penny Black', the world's first postage stamp, was introduced in England in 1840. The idea of postage stamps was a great success and was taken up worldwide. Yet the 'Penny Black' was in use for only one year before it was replaced by the 'Penny Red'. Why?

Added 1 January 2007

Hint: The reason still makes sense today, which is why you rarely see black stamps.
Solution: The postmark used at that time was always black. It was therefore difficult to tell whether a stamp had been franked or not. This led to people re-using used stamps. On a 'Penny Red' the black postmark was clearly visible.

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