FCP = Fluorescent coated paper PVAD = Polyvinyl alcohol acetate dextrin gum
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nd27

ND27 - Northern Ireland 10p greyish brown, FCP/PVAD, two 4.75mm screen 150 phosphor bands (Cyl 1) (Harrison/photo) - Deegam N100.1.1 - S.G specialised XN36 - Stoneham U36 - Concise NI27

Two 4.75mm phosphor bands from cylinder 1 [20.10.76]
nd28

ND28 - Northern Ireland 10p greyish brown, FCP/PVAD, 4mm screen 150 phosphor centre band (Cyl 1)(Harrison/photo) - Deegam N100.2.1 - S.G specialised XN37 - Stoneham U37 - Concise NI28

4mm phosphor centre band from cylinder 1 [23.7.80]