German East Africa » German East Africa, Forerunner Zanzibar. 1891 (Jul 31) envelope sent to Germany with 1889-1900 20pf tied by a very good strike of the German Zanzibar cds with further strike adjacent, sent on the last day of the German P.O. in Zanzibar, endorsed "pr S. S. Kaiser", reverse with Frankfurt arrival, vignette removed from lower left corner, very fine and attractive, a scarce cover. (Image)