Page 51 - Chinese International Airmail to 1949
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2.1.3 CNAC to Calcutta, BOAC Horseshoe Route to Khartoum, Trans-Africa to Lagos or Accra,
PAA to Miami via Brazil, air within USA to New York, PAA to Lisbon, thence to England
Rate 3: 1 Nov 1942 to 28 May 1943 (209 days). Surface first 20g $1.50 Air per 5g $11.70
23 Jul 1943 ‑ Loyuan to Mullingar, Ireland. No backstamps. Censored on arrival in Ireland.
Paid at the earlier rate for a single rate letter of $1.50 + $11.70 = $14.20. Correct rate should have been $2 + $13 = $15.
Rate 5: 1 Jun 1943 to 5 Nov 1943 (157 days). Surface first 20g $2 Air per 5g $13
1943 ‑ Lo Shan to London, England. No backstamps.
Single rate letter $2 + $13 = $15.