sd33
FCP = Fluorescent coated paper PVAD = Polyvinyl alcohol acetate dextrin gum
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SD33 - Scotland 9p Bluish violet, FCP/PVAD, two 4.75mm phosphor bands (Harrison/photo) - Deegam S90.1.1 - S.G specialised XS51 - Stoneham SC48 - Concise S28

From cylinder 1 [18.1.78]