unused 1918 (10 July) 1d. top left corner example with watermark reversed (B.P.A. certificate), 1918 (20 July) 3d. with watermark inverted, and 1919 (July) 3d. (2) with watermark inverted and inverted and reversed (B.P.A. certificate), fine mint. S.G. 92x, 98w, 105w, 105y