FCP = Fluorescent coated paper PVA = Polyvinyl alcohol acetate gum
PVAD = Polyvinyl alcohol acetate dextrin gum
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sd15_16

Two bands

SD15 - Scotland 3.5p Grey green, FCP/PVA, two 4.75mm phosphor bands (Harrison/photo) - Deegam S35.1.1 - S.G specialised XS37 - Stoneham SC35

From cylinder 1 [23.1.74]

SD16 - Scotland 3.5p Grey green, FCP/PVAD, two 4.75mm phosphor bands (Harrison/photo) - Deegam S35.2.1 - S.G specialised XS38 - Stoneham SC39 - Concise S17

From cylinder 1 [23.1.74]
sd18

Centre band

SD18 - Scotland 3.5p Grey green, FCP/PVAD, 4mm phosphor centre band (Harrison/photo) - Deegam S35.3.1 - S.G specialised XS39 - Stoneham SC40 - Concise S18

From cylinder 1 [6.11.74]