Hong Kong. (French Maroc). 1920. Stamp-less Official Mail envelope hand-stamped 'Le Resident General de France au Maroc/ Commandant en Chef' and cancelled Rabat Residence/ Maroc '6th Mars 1920' with boxed instructional 'Advertised/ Unclaimed' (struck twice on face) and Hong Kong receiver '27th April' on reverse. Nice item of instructional mail with scarce origin for Hong Kong.