Harold Forster was responsible for pre-war Black Magic chocolate illustrations, and the famous ‘Keep Mum, She’s Not So Dumb’ poster. He designed full-colour lithographic posters, and was personally commissioned to do work for the MOI by Edwin Embleton.
Information collated from: Anonymous, ‘Salute the Soldier Posters “Best Yet”‘, Advertiser’s Weekly, Vol. 123, No. 1,599, January 13 1944, p.53; Anonymous, ‘”Olga” is Mascot in Anti-Rumour Campaign for Services’, Advertiser’s Weekly, Vol. 112, No. 1,462, May 29 1941, p.146; Anonymous, Image with caption, Advertiser’s Weekly, Vol. 116, No. 1,518, June 25 1942, p.286; Questionnaire submitted by Royall, K. to Embleton, E., Royall, K., ‘Posters of the Second World War: The Fourth Arm of British Defence’, Unpublished M.A., University of Westminster, 1991, p.123
Featured Image: Harold Forster Facebook Page