£20
Covers; 1931 cover with USA stamps uncancelled, Norway 10ø cancelled Bergen 1.8.31, UK 1½d cancelled London 3.10.31 (?). Cover carried on Wilkins-Ellsworth Trans-Arctic Submarine Expedition, with expedition cachet (submarine was not able to make journey to North Pole as planned, but was the first to dive under the Arctic ice).
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