Page 110 - Chinese International Airmail to 1949
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3.4.1 Silver $ Rate UOR 23: 29 Apr 1949 to 4 Jul 1949 (67 days). Surface first 20g $0.10 Air per 10g $0.30. Gold $ stamps accepted at rate of 4,000,000:1 9 May 1949 ‑ Shanghai to New York, USA. Backstamped at New York on 14 May. Single rate letter $0.10 + $0.30 = $0.40. Total value of Gold $ 1,600,000 = Silver $ 0.40.
