nd13
OCP = Original coated paper PVA = Polyvinyl alcohol acetate gum
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ND13 - Northern Ireland 5p reddish violet, OCP/PVA, two 4.75mm screen 150 phosphor bands (Cyl 4) (Harrison/photo) - Deegam N50.1.1 - S.G specialised XN27 - Stoneham U20 - Concise NI18

Two 4.75mm phosphor bands from cylinder 4 [7.7.71]