unused Block of Four £1 black on red, a marginal block of four from the foot of the sheet, fresh mint and mounted in the margin only; one with tiny internal wrinkle. S.G. 126, £1,100+. Photo

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unused Block of Four £1 black on red, a marginal block of four from the foot of the sheet, fresh mint and mounted in the margin only; one with tiny internal wrinkle. S.G. 126, £1,100+. Photo