cover 1918 (c) XU5 (light vertical crease) to Ismaila bearing Hejaz 1pi. blue, cancelled by octagonal "AL-WAJH" d.s. in violet and showing double-ringed "MISSION B. - DETACHEMENT D'EL OUEDJ/ Le Chef de Detachement" cachet in violet, and endorsed at top "Zwollen 3me Groupe Artillerie SP 601 E1 Ouedj". Very fine and of the utmost rarity from this elusive town. Photo