nd42
FCP = Fluorescent coated paper PVAD = Polyvinyl alcohol acetate dextrin gum
PVA = Polyvinyl alcohol acetate gum
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Northern Ireland symbol types

Type 2a symbol - The pearls along the crown are separate from each other. Type 2b symbol - 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. The bottom pearl underneath the orb is attached to the central cross.
left_band_i1

ND42 - Northern Ireland 13p pale chestnut, type 2a, FCP/PVAD, 4mm 'SA' phosphor inset left band (I1) (Questa/litho) - Deegam N130.1.1 - S.G specialised XNL7 - Stoneham U57 - Concise NI37

Type 2a from cylinders Q1Q1, Q2Q2, Q3Q3, Q4Q4, Q5Q5, Q6Q6 [23.10.84]
s6_i1

ND44 - Northern Ireland 13p pale chestnut, type 2b, FCP/PVAD, 4mm 'SA' phosphor inset left bar (S6 + I1) (Questa/litho) - Deegam N130.1.2 - S.G specialised XNL8 - Stoneham U57b

FCP/PVAD, type 2b from cylinders Q1Q1, Q2Q2 [?.12.86]
s6_i1

ND45 - Northern Ireland 13p pale chestnut, type 2b, FCP/PVA, 4mm 'SA' phosphor inset left bar (S6 + I1) (Questa/litho) - Deegam N130.2.1 - S.G specialised XNL9 - Stoneham U58 - Concise NI37Ea

FCP/PVA, type 2b from cylinders Q1Q1, Q2Q2, Q3Q3, Q4Q4 [14.4.87]