Air Mail cover 1925 (19 Feb.) Cobham's Anglo-Indian Survey flight envelope from Drigh Road, Calcutta to Karachi bearing 1a., large pink label and triangular cachet in violet, signed by Elliott and Cobham; 1925 card to London, bearing uncancelled 1a., green label and triangular cachet, G.B. 1d. Postage Due applied on arrival. Also letter from Stephen Smith with triangular cachet and bearing two deep blue labels