cover 1916 (11 May) envelope (197x135mm.) to Holland, marked "Manuscript without letter--Missionary matter only (for enemy country enclosed)", bearing Australia Kangaroo 1d. pair perf. small "OS" and NWPI ½d. tied by "MADANG" c.d.s. and showing "OPENED BY CENSOR" labels (2) in violet at left. Rare and attractive