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An Austrian museum association has asked its Twitter followers to help deciphering an old postcard. So far, no solution has been tweeted. Can a reader of this blog solve this mystery?

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In 1905 a certain Miss Rhodes from Colchester, UK, received an encrypted postcard signed with “C.Y.K.”. Can you decipher it?

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A Reddit user has posted a postcard from Sweden written in 1910. Can a reader decipher it?

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Here’s a postcard that was sent from the Isle of Wight to London in 1905. Can a reader decipher it?

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In 1901 an unknown person sent an encrypted postcard from Iserlohn, Germany, to nearby Arnsberg. Can a reader decipher it?

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A postcard from 1903 is encrypted in a dancing men code, like it is described in a famous Sherlock Holmes story. Can a reader decipher it?

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Here’s a postcard written in English that contains two kinds of encryption. Can a reader decipher this two-part cryptogram?

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Here’s another crypto postcard. As the encrypted part of the message has only 17 letters, it is probably hard to decipher.

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In 1909, an unmarried woman in Newcastle, Australia, received an encrypted postcard. Can a reader decipher it?

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Only three of the many encrypted postcards I have covered on this blog so far have remained unsolved. The one I am going to introduce today might be number four.