sd20_21
OCP = Original coated paper PVA = Polyvinyl alcohol acetate gum
FCP = Fluorescent coated paper
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SD20 - Scotland 5p Reddish violet, OCP/PVA, two 4.75mm phosphor bands (Harrison/photo) - Deegam S50.1.1 - S.G specialised XS41 - Stoneham SC28 - Concise S20

From cylinder 3 [7.7.71]

SD21 Scotland 5p Reddish violet, FCP/PVA, two 4.75mm B3 phosphor bands (Harrison/photo) - Deegam S50.2.1 - S.G specialised XS42 - Stoneham SC36

B3 phosphor from cylinder 3 [6.73]

SD21J - Scotland 5p Reddish violet, FCP/PVA, two 4.75mm Jet phosphor bands (Harrison/photo) - Deegam S50.2.1a - Stoneham SC36b

JET phosphor from cylinder 7 [8.73]