sd19
FCP = Fluorescent coated paper PVAD = Polyvinyl alcohol acetate dextrin gum
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SD19 - Scotland 4.5p bluish grey, FCP/PVAD, two 4.75mm B3 phosphor bands (Cyl 1) (Harrison/photo) - Deegam S45.1.1 - S.G specialised XS40 - Stoneham S41 - Concise S19

Two 4.75mm B3 phosphor bands from cylinder 1 [6.11.74]