Air Mail cover 1922 (1 Sept.) Peking - Petaiho Beach second series registered flight XU5 bearing 8c. (on reverse) and Air 30c. and 90c. cancelled by c.d.s., and 1923 (23 Aug.) Petaiho Beach - Peking third series registered flight XU5 to Shanghai bearing 2c. on 3c. (4, on reverse) and Air 15c. to 90c. cancelled by c.d.s., with Peking (27.8) and Shanghai (29.8) c.d.s.