ZANZIBAR. FIRST FLIGHT COVER

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ZANZIBAR. FIRST FLIGHT COVER: Postmarked with box-cancel, 'Post Office, Zanzibar, Empire Mail (South Bound) First Flight Cover 3rd July, 1937'. Orig. sent Reg. to Johannesburg, South Africa with circular postmark dated 7 JUL 37. Then sent return mail via Daresalaam with oval postmark dated 12 JY 1937 back to Zanzibar. Postmarked 13 JY 37 Zanzibar. Toned and worn cover with a story to tell.