Postage Due stamps. 1948-79, Gunboat ''Zefir'', 2m-20m, complete set of four on paper with watermark SG, in addition 10m and 20m re-issued in 1979 on Sudan Arms (Rhinoceros) watermarked paper, which are scarce and not priced in Scott and SG, full OG, NH, VF, SG #D12 -15, fn, Est. $250-$300 (Image)