A very special cover indeed.
First day cover for the James Bond stamp issue. Based on Ian Fleming's links with Bletchley Park, a source of inspiration for his James Bond stories.
"Operation Ruthless" was Ian Fleming's plan to capture the German naval Enigma codes in 1940. It has all the elements of a "Bond" plot.
We have a few signed by Kathleen Warren. A Bletchley Park code breaker whose father was Admiral John Godfrey othewise known as "M".
See also the Chitty Chitty Bang Bang stamp sheet in the Smiler section.