PCP = Phosphor coated paper PVA = Polyvinyl alcohol acetate gum
ACP = Advanced coated paper PVAD = Polyvinyl alcohol acetate dextrin gum
!
nd70

ND70 - Northern Ireland 22p deep blue, PCP/PVA (Cyls Q1Q1, Q2Q2) (Questa/litho) - Deegam N220.1.1 - S.G specialised XNL37 - Stoneham U46 - Concise NI53

From cylinders Q1Q1, Q2Q2 [8.4.81]
nd71

ND71 - Northern Ireland 22p yellow green, ACP/PVAD (Cyls Q1Q1, Q2Q2) (Questa/litho) - Deegam N220.2.1 - S.G specialised XNL38 - Stoneham U78 - Concise NI54

From cylinders Q1Q1, Q2Q2 [23.10.84]
nd73

ND73 - Northern Ireland 22p flame, ACP/PVAD (Cyls Q1Q1, Q2Q2) (Questa/litho) - Deegam N220.3.1 - S.G specialised XNL39 - Stoneham U79 - Concise NI55

From cylinders Q1Q1, Q2Q2 [4.12.90]