nd52
PCP = Phosphor coated paper PVAD = Polyvinyl alcohol acetate dextrin gum
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ND52 - Northern Ireland 16p pale mushroom, PCP/PVAD, perforation 13.75 X 14 (Cyls Q1, Q2) (Questa/litho) - Deegam N160.1.1 - S.G specialised XNL15 - Stoneham U49 - Concise NI42

Perforation 13¾ X 14 from cylinders Q1, Q2 [27.4.83]

ND53 - Northern Ireland 16p pale mushroom, PCP/PVAD, perforation 14.75 X 14 (Cyls Q3, Q4) (Questa/litho) - Deegam N160.1.2 - S.G specialised XNL16 - Stoneham U64 - Concise NI42a

Perforation 14¾ X 14 from cylinders Q3, Q4 [28.2.84]