1883, France 15c Sage on cover, military concessionary rate cover, tied by cds ”ESCAD.DE LA MEDIT./MARSEILLE 27 AVRIL 1883” and boxed ”CORR. DES ARMEES” alongside. These two postmarks are only known according to Salles, on French colonial stamps. Very fine rarity of Indo-China. ONLY KNOWN COVER WITH FRENCH STAMPS USED IN COMBINATION WITH THE RARE BOXED ”CORR. DES ARMEES AND THE ”ESCADRE DE LA MÉDITERRANÉE” CDS ORIGINATING FROM THE SINO-FRENCH TONKIN WAR (1881 - 1885).