1931, Wilkins-Ellsworth Trans-Arctic Submarine Expedition. Neat attractive hand-drawn cacheted registered cover autographed by Hubert Wilkins, with purple Expedition cachet, franked with strip of 3 1½d G.B. KGV definitive with oval registry postmarks "Ludgate Circus B.O., 19 Oct 31" and U.S.A. 2¢ coil, tied by New York, May 8 1931 duplex; this dual franking was typical for mail associated with the Expedition; trivial soiling does not detract; still Very Fine. Estimate  $100 - 150. $0 (Image)