1909 (22.8.), King Carlos I. 2½r. grey/black on address side and four different other stamps used on picture side for registered used with 'DEUTSCHE SEEPOST OST-AFRIKANISCHE HAUPTLINIE k' cds. to Germany, picture on reverse 'Lourenco Marques Ponta Vermelha a Dunas de areia, Reuben Point and Sand Dunes', minor blemishes nevertheless an unusual usage! (Image)