unused Block Larger Than four -- 3p. in black on 4a., two lower left corner mint blocks of ten (2x5), one from the 1st printing showing varieties "THRER" and "FHREE" for "THREE", the other from the 2nd printing with the varieties corrected; the first with a few reinforced perfs. and two non-varieties with inclusions. A scarce pair of positional multiples. S.G. O325, a, b; 300+