nd30
FCP = Fluorescent coated paper PVAD = Polyvinyl alcohol acetate dextrin gum
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ND30 - Northern Ireland 11p pastel red, FCP/PVAD, two 4.75mm screen 150 phosphor bands (Cyl 1) (Harrison/photo) - Deegam N110.1.1 - S.G specialised XN39 - Stoneham U39 - Concise NI30

Two 4.75mm  phosphor bands from cylinder 1 [20.10.76]

ND31 - Northern Ireland 11p pastel red, FCP/PVAD, phosphor omitted (Cyl 1) (Harrison/photo) - Deegam N110.1.1a - S.G specialised XN39a - Stoneham U39a - Concise NI30Ey

Phosphor omitted from cylinder 1