U.S.S. Bear, Mar. 5, 1940 A.M. -- Palmer Land.
Duplex datestamp ties 3c Panama Canal on cacheted cover signed by Adm. Richard E. Byrd
and other crew members, according to South-Pole.com, this cover was "carried on the three hour exploratory flight, February 27, 1940. The flight of the Barkley-Grow from the U.S.S. Bear was along the coast from 90°W to 100°W; it was on this flight that the Thurston Peninsula was determined to actually be an island. Admiral Richard E. Byrd was on this flight as an observer.", Very Fine, Byrd left the expedition soon after this flight, thus covers signed by him are scarce
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