China. (Tibet). 1957. Envelope addressed to 'The Indian Postal Agency, Lhasa, Tibet' bearing Great Britain 'Wilding' SG 519, 2 1/2d scarlet tied by Manchester slogan '9th June', endorsed 'No Indian Post Office in Lhasa/ Return' with Lhasa arrival '2 July', boxed 'Lhasa/ Dead Letter Office' with 'Retour' and returned via Gangtok '12th Sept' and Calcutta D.L.O. '29 Sept' with vernacular Gantok 1st Nov'. Interesting item.