unused Block Larger Than four -- 1c. and 5c. blocks of ten (2x5) from the left of the sheet with second row of comb perfs. missing, each thereby resulting in two imperf. vertically pairs, and 2c. block of ten (2x5) from the left of the sheet with second to fourth rows of comb perfs. missing thereby resulting in two imperf. vertically strips of four. Rare and spectacular. L. D15a, 16a, 17a. Photo for 2c. in colour