Board of Commissioners of Currency, Singapore, $100 (2), 1973, serial numbers A/5 108771-72, purple and violet on multicolour underprint, Cattleya orchid at centre, arms at right, reverse blue, sailing ships at centre, Hon Sui Sen signature with red seal (Pick 6d, TBB B106d), in ICG holders number 66, choice uncirculated, rare as a consecutive pair and in this grade (2)