Page 31 - Chinese International Airmail to 1949

1.4.1 Internal Acceleration by Airmail

Rate 3: 1 Feb 1936 to 31 Aug 1939 (1,308 days). Air in USA only. Surface first 20g $0.25 Registration fee $0.25

11 Dec 1937 ‑ Tientsin to New York. Backstamped at Shanghai (19 Dec), Seattle (13 Jan) and New York (17 Jan).
No internal air surcharge in China; USA internal air surcharge $0.45 per 15g. Rate $0.25 + $0.45 + $0.25 = $0.95.