£270
1951 1d Light ultramarine 'keyhole' flaw block mint (SG504var)
1951 1d Light ultramarine (SG504var). Superb unmounted o.g. right-hand marginal block of six showing sheet number ?935199? in sheet margin with ?Keyhole? flaw (Cyl. 192 no dot, R 6/12). Rare variety. Spec. Q6d. SG504var.
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