nd51
PCP = Phosphor coated paper PVAD = Polyvinyl alcohol acetate dextrin gum
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ND51 - Northern Ireland 15.5p pale violet, PCP/PVAD (Cyls Q1, Q2) (Questa/litho) - Deegam N155.1.1 - S.G specialised XNL13 - Stoneham U48 - Concise NI41

PCP from cylinders Q1, Q2 [24.2.82]