nd23
FCP = Fluorescent coated paper PVAD = Polyvinyl alcohol acetate dextrin gum
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ND23 - Northern Ireland 8.5p yellowish green, FCP/PVAD, two 4.75mm screen 150 phosphor bands (Cyl 1) (Harrison/photo) - Deegam N85.1.1 - S.G specialised XN34 - Stoneham U34 - Concise NI25

Two 4.75mm phosphor bands from cylinder 1 [14.1.76]