£150
1933 (Apr 7) Houston Mount Everest Expedition, cover flown on the first survey flight with flight vignette and cachet, posted from Purnea franked KGV 3p + 1a, reverse with a further flight cachet and Calcutta arrival c.d.s, signed by Stephen Smith. 87 Covers flown on behalf of the Aero Club of India, sold at one guinea each in aid of R.A.F charities, minor toning.
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