Printed 'Czechoslovak Army in Exile' postcard datelined '2/Ls. Stefan Hacker, P.O.B 226 - London E.C.1.' on reverse franked with 1937 1/- bistre brown and 1941 3d pale violet GVI issue (SG 475 & 490) tied by C.S.P.P. A CZECHOSLOVAK FIELD POST cds dated 5 JAN 1944. Sent airmail to USA with octagonal 'PASSED' censor mark in violet on front. P.O.Box 226 was the undercover address for mail sent to and from soldiers in the Czech resistance army.