cover SHANGHAI DEFENCE FORCE: 1927 (June-Oct.) and 1928 (Jan.) envelopes (4, three registered) to England, bearing various G.B. values to 9d. tied by "ARMY POST OFFICE/1" double-ring c.d.s. used at Army Headquarters, Kalee Hotel and showing three different registration h.s./labels; also 1935 (Jan.-Nov.) envelopes (3) registered to England, bearing various G.B. 1935 Jubilee values and cancelled by "FIELD POST OFFICE/1" double-ring c.d.s. used at British Barracks, Tientsin