cover 1903 envelope (vertical filing fold) to Saigon, showing double-ringed "DETACHEMENT D'OCCUPATION DE CHANTABOUN/SIAM/LE COMMANDANT" cachet in blue and "SAIGON COCHINCHE/CORPS EXPE" c.d.s. (14.4), endorsed "Troupes d'occupation du Siam". Scarce local regional use