B210 (PNL): 50 pounds (US$63)
Red. Front: English text; Bank of England seal; King Charles III; coronation crown; computer chip circuitry; Bank of England headquarters, London; coats of arms; King Charles III. Back: 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 Turing14’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. Kurz’s Kinegram Colors holographic stripe. No security thread. Watermark (shadow image): None. Printer: (De La Rue). 146 x 77 mm. Polymer (Guardian).
a. 2023. Sig. 33: John. Intro: 05.06.2024.
Courtesy of Christopher Nield.