GB 1979 SGX925a Mint - imperforate pair from Cylinder 12.
Stock Code: P189009048
1979 1p Crimson (PVAD/FCP, Head type B1). Very fine unmounted o.g. bottom left hand corner marginal irregular block of 14 from cylinder "12.", the far right hand vertical pair imperforate. Folded vertically along central sheet divider. Scarce, only twenty imperforate pairs discovered, this being the unique cylinder proving piece. Spec. U63a.
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