PCP = Phosphor coated paper PVAD = Polyvinyl alcohol acetate dextrin gum
ACP = Advanced coated paper
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nd81

Bluish violet

Northern Ireland symbol types

Type 1 symbol - The left side of the hand is curved - The white line on the hand is very fine or missing altogether. Type 2b - The second pearl to the left of the orb is joined to the crown and the first three on the left side of the crown are joined to each other.

ND81 - Northern Ireland 28p bluish violet, PCP/PVAD, type 1 symbol, perforation 13.75 X 14 (Cyls Q1, Q2) (Questa/litho) - Deegam N280.1.1 - S.G specialised XNL52 - Stoneham U53 - Concise NI62

Type 1, perforation 13¾ X 14 from cylinders Q1, Q2 [27.4.83]

ND82 - Northern Ireland 28p bluish violet, ACP/PVAD, type 2b symbol, perforation 14.75 X 14 (Cyls Q1, Q2) (Questa/litho) - Deegam N280.2.1 - S.G specialised XNL53 - Stoneham U82 - Concise NI62a

Type 2b, perforation 14¾ X 14 from cylinders Q1, Q2 [27.1.87]
nd83

ND83 - Northern Ireland 28p slate blue, ACP/(PVA (Cyls Q1Q1, Q2Q2) (Questa/litho) - Deegam N280.3.1 - S.G specialised XNL54 - Stoneham U72 - Concise NI63

From cylinders Q1Q1, Q2Q2 [3.12.91]