unused Block Larger Than four 2½d. on 20pf. ultramarine, a marginal block of thirty (5x6) showing five with no fraction bar and five with "1" to left of "2" in "½"; a few split perfs otherwise fine mint. S.G. 104/a/b, £1390

Details
unused Block Larger Than four 2½d. on 20pf. ultramarine, a marginal block of thirty (5x6) showing five with no fraction bar and five with "1" to left of "2" in "½"; a few split perfs otherwise fine mint. S.G. 104/a/b, £1390
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