The hidden date for this stamp can be found along the bottom edge of the stamp.
During the early days of the Second World War, Canadian citizens and the postal authorities believed that Canadian postage stamps current since 1938, should be replaced by new designs. The Department decided to show Canada's contribution to the war effort of the Allied Nations. In 1943 the Post Office Department issues new denominations of postage stamps to meet the amended rate of postage, effective 1st April, 1943. No new designs were introduced. The colour of the 3-cent stamp of the 1942 issue was changed to purple, when stocks on hand became depleted.
Portrait of His Majesty King George VI in Royal Air Force uniform, from a portrait by Hugh Cecil of London, England.