1882 KEBLE COLLEGE, OXFORD ½D ULTRAMARINE GOOD UNUSED BLOCK OF EIGHT, FOUR HORIZONTAL PAIRS 'ERROR IMPERFORATE BETWEEN VERTICAL PAIR' (SPEC CS10a). A good unused marginal block of eight 1882 Keble College, Oxford ½d ultramarine, four horizontal pairs all showing fine variety 'ERROR IMPERFORATE BETWEEN VERTICAL PAIR' (CS10a). A very rare variety and the first such piece we have handled for many years. (Ref 142495).
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