sd31
FCP = Fluorescent coated paper PVAD = Polyvinyl alcohol acetate dextrin gum
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SD31 - Scotland 8p red, FCP/PVAD, two 4.75mm B3 phosphor bands (Cyl 1) (Harrison/photo) - Deegam S80.1.1 - S.G specialised XS49 - Stoneham S46 - Concise S26

Two 4.75mm B3 phosphor bands from cylinder 1 [23.1.74]