1927: Cover to London franked by Zanzibar 1 c. brown (2), 3 c. yellow-orange and block of four 10 c. olive-green, all tied by 'Zanibar' squared circle datestamps (Feb 15) and by KENYA-SUDAN / AIR MAIL cds (Feb 15) in red. Reverse with Cairo transit (Feb 20). A scarce flight. (Image 1) (Image 2) (Image)