British East Africa. (Great Britain). 1952. Air Mail envelope written from the Ottaoman Bank, London addressed to Kenya cancelled by London '0/9' meter cachet with boxed 'T/ F.S./ 60c' and framed 'Insufficient Postage/T 50 Cents To Pay' in violet on face and bearing Tanganyika postage dues SG D8, 10c scarlet (strip of five) tied by Nairobi/ Poste Restante '11th Nov 52' . Scarce receiver applied on Unpaid (Tax) mail.