Antarctica: First Byrd Expedition 1928-30: South Pole First Flight, attractive flown cover signed by all four members of the crew, Byrd, Balchen, June and McKinley, with “SOUTH POLE AIR MAIL” imprint on cachet, handstamped date “NOV 28 ‘29”, bearing U.S. Air 5c. cancelled by SS “City of New York” Feb. 19 duplex on arrival at Little America. One of fifty carried and very rare with all signatures. Photo. (Image1)