nd69
PCP = Phosphor coated paper PVAD = Polyvinyl alcohol acetate dextrin gum
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ND69 - Northern Ireland 20.5p ultramarine, PCP/PVAD (Cyls Q1, Q2) (Questa/litho) - Deegam N205.1.1 - S.G specialised XNL36 - Stoneham U51 - Concise NI52

From cylinders Q1, Q2 [27.4.83]