Proof Specimen Block Larger Than four OVERPRINTED "WATERLOW & SONS LTD./SPECIMEN" IN BLACK: The range of seventeen sample sheets comprising ½d. brown, ½d. green, 1d. black and blue-green, 2d. indigo, 2d. green (the only known sheet?), 2½d. "WAKATIPU" yellow-brown, 3d. brown-purple, 3d. Prussian blue, 4d. green, 4d. orange, 5d. blue-green, 5d. bright purple, 6d. carmine, 8d. purple-brown, 8d. vermilion, 1/- slate-purple and 5/- black. An exceptional lot