Air Mail cover 1925 (16 Feb.) Cobham's Anglo-Indian Survey flight, ½a. card carried from Calcutta to Delhi, cancelled by Havelock Square c.d.s. and showing Postage Due horseshoe h.s. and black on pink label alongside, signed by Arthur B. Elliott on reverse

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Air Mail cover 1925 (16 Feb.) Cobham's Anglo-Indian Survey flight, ½a. card carried from Calcutta to Delhi, cancelled by Havelock Square c.d.s. and showing Postage Due horseshoe h.s. and black on pink label alongside, signed by Arthur B. Elliott on reverse