Whitman Expo
2020 Sig 33: John Prefix AA Intro: Expected 23 06 2021 50 pounds Values
Details
Obverse: English text; Bank of England seal; Queen Elizabeth II; coronation crown; computer chip circuitry; Bank of England headquarters, London; coats of arms; Queen Elizabeth II
Reverse: English text; mathematical table and formulae from Turing’s seminal 1936 paper, “On Computable Numbers, with an application to the Entscheidungsproblem;” ticker tape depicting Alan Turing’s birth date (23 June 1912) in binary code; technical drawings for the British Bombe; Automatic Computing Engine (ACE) Pilot Machine; Alan Turing; sunflower head as red foil patch
