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From Lungchow to Indo-China. CIP 2c and 4c canceled by Lungchow Bilingual Dater on March 24, 1902. French Indo-Chinese 5c and 10c added and forward to Lang-Son where canceled by Lang-Son Tonkin Indo-Chinese P.O. CDS on March 25, 1902. Arrival Hanoi CDS of March 26, 1902. This mail was sent almost three months after the Sino-French postal treaty came into force on January 1, 1902. Did the treaty not apply to the Indo-China offices. The international rate was 10c per 1/2 ounce at that time. Why did this cover pay only 6c and receive no postage due treatment?

Note for Question No. 4

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