First day cover for the Royal Mail "House of Tudors" issue. The reign of the Tudors was when cryptography and cryptoanalysis came of age.
The cover design depicts codes from the Tudor period and six influential figures in the development of codes and ciphers. On the rear are their names and roles. Even the first day of issue cancel has a coded message!
A remarkable cover for a period often referred to as "The Golden Age". Now you can discover the secret world behind the throne.