China. (India). 1943. Air Mail envelope written from the 'Friends Mission, Chin Lung Kai, Chengtu' addressed to London bearing SG 641a, $5 carmine (3) tied by Chengtu date stamp, endorsed 'via B.O.A.C. to Egypt/ then quickest way', with bilingual 'Par Avion' label, routed via India with Calcutta 'P.C. 90/ Opened by Examiner' label. Very fine.