cover 1881 (Jan.) XU5 from Walter Thompson, serving with the Eastern and South African Telegraph Company, to his wife in London, bearing India ½a. and 4a. tied by fine "BRITISH/P.O./ZANZIBAR/B" duplex, showing red London Paid arrival c.d.s. and, on reverse, Aden transit d.s. (20.1). Scarce and appealing. Photo