British. A Careless talk poster, illustrated with civilian and armed forces headgear, with the slogan ‘The more information you keep under your hat' (trilby hat) and the caption ‘the safer he'll be under his' (steel helmet). As with many Careless talk posters, the images focus on the head area, indicating whatever knowledge was contained in the head, it should be kept there.
/....BRITISH WWII Keep Mum .. Agent ‘Fifi': The stunning British spy who seduced secrets of war from her ‘prey By Terrence McCoy September 18, 2014 A World War II propaganda poster created in 1941 by Harold Forster. “Keep Mum She’s Not so Dumb” is typical of Second World War British propaganda attempts to instill caution in the public through humorous, memorable slogans, rather than through fear-inducing images of spies and saboteurs. (Courtesy of Imperial War Museums/.JAN16