1923 (May 30) Experimental Service from Peking to Tientsin, cover franked with 45c airpost and additional adhesives, paying a total of 48c, all tied by Peking cds, with violet bilingual "Aeroplane Service - Tientsin C.P.O." arrival datestamp, fine-v.f. This service was suspended October 31, 1923 (Cat No. AAMC 4) (Image)

Est.$750