k_nd12
FCP = Fluorescent coated paper PVAD = Polyvinyl alcohol acetate dextrin gum
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ND12 - Northern Ireland 4.5p bluish grey, FCP/PVAD, two 4.7.5mm screen 150 phosphor bands (Cyl 1) (Harrison/photo) - Deegam N45.1.1 - S.G specialised XN26 - Stoneham U28 - Concise NI17

Two 4.75mm phosphor bands from cylinder 1 [6.11.74]