Bletchley Park Post Office FDC

For the Royal Mail "House of Tudor" stamp issue on 21 April 2009 Bletchley Park Post Office's first day cover takes a secret twist. The double-sided cover design features Tudor cryptography and the cancel is a Caesar Shift Wheel incorporating a piece of code. Linked to the monarchs depicted on the stamps are stories about the plots and intrigues of their spymasters. The cover insert describes these and also has a code wheel that can be used to create secret messages.

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