Air Mail cover -- XU5 carried on Peking-Shanghai return flight bearing on reverse 1c. on 2c. (2), 3c. on 4c. and 5c. on 6c. and on front Air 15c. to 90c. cancelled by c.d.s., showing special Peking "chop" in violet and Shanghai arrival c.d.s. (2.7) adjacent, minor foxing around perfs. Photo