cover Arctica, 1931, Wilkins-Ellsworth Trans-Arctic Submarine Expedition, red illustrated cachet on United States 1c Green Postal Card (UX27), addressed to Paola, Kansas, with Great Britain King George V 1½p and 3p tied by London oval registered d.s., London registration label, New York d.s., printed advertisement on reverse, blue crayon registry marking affects the 3p, still very fine