Air Mail cover 1924 (1 Aug.) opened out envelope to Tientsin bearing Air 15c. and 30c. (still bearing backing paper) with Junk 3c. tied by Peking (2) despatch c.d.s. and the bilingual "To be despatched by/Aerial Service" in black, the reverse with two strikes of the Tientsin arrival c.d.s. Rare with only five covers recorded. Photo

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Air Mail cover 1924 (1 Aug.) opened out envelope to Tientsin bearing Air 15c. and 30c. (still bearing backing paper) with Junk 3c. tied by Peking (2) despatch c.d.s. and the bilingual "To be despatched by/Aerial Service" in black, the reverse with two strikes of the Tientsin arrival c.d.s. Rare with only five covers recorded. Photo