Airmail cover franked with 1920 400rs blue 'Industry' issue and 1929 5000rs violet blue 'Barbosa' issue (SG 406 & 465) tied by SERVICIO AEREO AMAZONAS cds's dated 30 IV 1940. Addressed to KANO, NORTHERN NIGERIA, BRITISH WEST AFRICA with arrival cds on reverse and 'PASSED BY CENSOR 12 NIGERIA' censor mark in red on front. A very scarce destination from the Amazon.