Antarctica: Wilkins-Hearst Expedition 1928-30: ‘Iceberg’ envelope to U.S.A. signed by Hubert Wilkins dated Mar. 1929, bearing Chile 10c., 15c., cancelled Puerto Montt Feb. 12 and backstamped Valparaiso Feb. 15, with expedition cachet “Wilkins Antarctic/Expedition/Deception/Island” in violet, slightly water affected otherwise fine. Photo. (Image1)