nd18
FCP = Fluorescent coated paper PVAD = Polyvinyl alcohol acetate dextrin gum
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ND18 - Northern Ireland 7p brown, FCP/PVAD, 4mm screen 150 phosphor centre band (Cyl 1) (Harrison/photo) - Deegam N70.1.1 - S.G specialised XN3 - Stoneham U321 - Concise NI22

4mm phosphor centre band from cylinder 1 [18.1.78]