Page 18 - Chinese International Airmail to 1949

1.2.2 Air France Hanoi to Marseilles; Eurasia feeder service from Kunming

Rate to Europe: 10 Jul 1936 to 18 Apr 1939.
Surface first 20g $0.25 Air per 5g $0.65

28 Dec 1938 ‑ Kunming to Berlin, Germany. No backstamps.
Single rate letter $0.25 + $0.65 = $0.90. Seldom encountered single adhesive paying correct rate.

4 Jan 1939 ‑ Kunming to Paris, France. No backstamps.
Double rate letter $0.25 + 2 x $0.65 = $1.55.