bearing 6a. tied by experimental square barred obliterator showing, on reverse, "FIELD P.O./MAR 20" in circle (Kurram F.F. Peiwar Cantonment), Kohat, Bombay and arrival c.d.s. A fine and very rare 1st Phase cover. Photo" /> cover 1879 (20 Mar.) envelope to Devon<I> "via Brindisi"</I> bearing 6a. tied by experimental square barred obliterator showing, on reverse, "FIELD P.O./MAR 20" in circle (Kurram F.F. Peiwar Cantonment), Kohat, Bombay and arrival c.d.s. A fine and very rare 1st Phase cover. Photo | Christie's