FCP = Fluorescent coated paper PVAD = Polyvinyl alcohol acetate dextrin gum
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nd10

ND10 - Northern Ireland 3.5p grey green, FCP/PVAD, two 4.75mm screen 150 phosphor bands (Cyl 1) (Harrison/photo) - Deegam N35.1.1 - S.G specialised XN24 - Stoneham U26 - Concise NI15

Two 4.75mm phosphor bands from cylinder 1 [23.1.74]
nd11

ND11 - Northern Ireland 3.5p grey green, FCP/PVAD, 4mm screen 150 phosphor centre band (Cyl 1) (Harrison/photo) - Deegam N35.2.1 - S.G specialised XN25 - Stoneham U27 - Concise NI16

4mm phosphor centre band from cylinder 1 [6.11.74]