The hidden date for this stamp can be found along the bottom edge of the stamp.
With the exception of the war issues of 1942-43 and certain special commemorative stamps, all pictorial postage stamps issued between 1927 and 1945 have illustrated subjects relating to Canada's history, geography, agriculture, and natural resources. The end of the war provided desirable opportunity to use subjects emphasizing the new industrial importance of Canada. In 1946 the Department decided to replace Canada's wartime pictorial postage stamps with an issue intended to provide a pictorial survey of Canada's primary industries and raw materials. The issue placed emphasis on the reconversion of Canadian industry to a peacetime basis.
View of a hydro-electric power station on the St. Maurice River, Province of Quebec. Since water power developments are of paramount importance to Canada's manufacturing industries, the design emphasizes how richly Canada is endowed with these resources.