Tanganyika. (Switzerland). 1942. Envelope addressed to Switzerland bearing SG 139, 20c orange and grey tied by Arusha double ring with 'Opened by Examiner/R/4' censor label, underpaid with circular 'T/Cents 20' hand-stamp in violet on face and bearing Swiss postage due Yvert 70, 20c rose tied by Kesswil arrival. Nice combination.