12½c on 3p black & blue green, 12½c on 5p yellow green & sepia and 12½c on 15p vermilion & black and 25c on 3p black & blue green, 25c on 5p yellow green & sepia and 25c on 15p vermilion & black, the complete set of fifteen showing all four types of '25' on each of the three values. A very difficult set to assemble. (SG 179/184D)