Bank of England, £50, 23 June 2021, serial number AA01 001939, red, Queen Elizabeth II at right and in a transparent window at left with text £50 BANK OF ENGLAND. Microchip image in gold and red, red, Queen Elizabeth II at right and in a transparent window at left with text £50 BANK OF ENGLAND. Microchip image in gold and two 21 spiral features in green appear two 21 spiral features in green appear over the window, a second smaller window based on Bletchley Park low right. Reverse red, a photo of Turing and a table and mathematical formulae, the Automatic Computing Engine (ACE) Pilot Machine and technical drawings for the British Bombe, a red foil patch at upper right with letters AT is based on the image of a sunflower head. Ticker tape depicting Alan Turings birth date (23 June 1912) in binary code. (EPM B418), The first Enigma machine captured by Poland., Year Turing first reported to Bletchley Park, the day after war was declared
