An unsent letter from 17th century baffles historians. What's the mystery of the 'Locked Letter'?
The letter, dated July 31, 1697, remains unopened and unread. It's sealed with a complex locking mechanism, lost to time.
The 'Locked Letter' was found in The Hague's postal museum, part of a 'prize papers' collection of undelivered 17th-century letters. Its complex locking method, known as 'letterlocking', is a mystery in itself. The technique was often used to secure information, but this letter's intricate fold puzzles historians. Could it be a spy's encryption, a secret lover's note, or a political plot?
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