APR.8.1933 First Mount Everest Survey Flight Covers, with a small 1a3p stationery cover and a larger cover franked with a 1a and a 3p definitives, cover addressed to Calcutta. with the special Union Jack flag label prepared for the occasion and the large fancy cachets in purple.still scarce, with only 87 covers flown. on beck signature by the pilot. signed by Stephen H. Smith
