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 phosphor bands (Harrison/photo) - Deegam S45.1.1 - S.G specialised XS40 - Stoneham SC41 - Concise S19

From cylinder 1 [6.11.74]