Page 103 - Chinese International Airmail to 1949
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3.3.7 Gold $ Rate UOR 17: 1 Mar 1949 to 10 Mar 1949 (10 days). Surface first 20g $300 Air per 10g $800 5 Mar 1949 ‑ Shanghai to New Westminster, Canada. No backstamps. Double rate letter $300 + 2 x $800 = $1,900.
