Air Mail cover 1923 (28 May) Peking - Tiensin flight postcard bearing 1½c. and Air 15c. cancelled by c.d.s., showing bilingual "To be despatched by/Aerial Service" h.s. and clock-type "28 MAY 1923/AEROPLANE SERVICE/TIENTSIN/G.P.O." d.s. in violet adjacent. Photo