1915-16 'Roo' 3d. yellow-olive, two singles optd. "N. W./PACIFIC/ISLANDS." in Type 6a and 6c, resp., used on registered cover from Rabaul to England, tied by "RABAUL/7 MR 18" cds, with German "Deutsch-Neuguinea" Reg. label on front, Sydney transit cds and London Reg. '16 MY 18' arrival oval on the reverse. Cover lightly stained otherwise fine. (Image)