The Helen Davis Collection of Penguins: Norway: Norwegian, British, Swedish Antarctic Expedition 1949-52, commercial cover “By Air Mail” with rare “1949-1952 NORWEGIAN-BRITISH-SWEDISH ANTARCTIC EXPEDITION/(penguin)/MAUDHEIM” cachet only seen on mail from expedition members, franked South Africa 3d., 6d. cancelled Cape Town 22 Dec. 1950, slight soiling. Photo. (Image1)