unused Block of Four ½d. grey, perf. 12½, 1d. carmine perf. 12½x12 and 2d. olive-bistre, perf. 12½, each in a block of four, the ½d. and 1d. blocks each including one stamp with square stop, the 2d. block marginal from the foot of the sheet, all with virtually full original gum; extremely scarce. Holcombe Certificate (1996). Photo