nd19
OCP = Original coated paper PVA = Polyvinyl alcohol acetate gum
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ND19 - Northern Ireland 7.5p pale chestnut, OCP/PVA, two 4.75mm screen 150 phosphor bands (Cyl 6) (Harrison/photo) - Deegam N75.1.1 - S.G specialised XN32 - Stoneham U21 - Concise NI23

Two 4.75mm phosphor bands from cylinder 6 [7.7.71]