on piece MILITARY MAIL: 1861 (28 July) part cover bearing France 1853-61 40c. (margins touched to large) tied by a superb strike of "CECA" lozenge (this was the French Bureau at Saigon between February 1861 and June 1862) with "CORPS EXP.CHINE/BA/SU A" c.d.s. alongside. Very scarce