nd17
FCP = Fluorescent coated paper PVAD = Polyvinyl alcohol acetate dextrin gum
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ND17 - Northern Ireland 6.5p cerulean blue, FCP/PVAD, 4mm screen 150 phosphor centre band (Cyls 1, 2) (Harrison/photo) - Deegam N65.1.1 - S.G specialised XN30 - Stoneham U31 - Concise NI21

4mm phosphor centre band from cylinders 1, 2 [14.1.76]