wd28
FCP = Fluorescent coated paper PVAD = Polyvinyl alcohol acetate dextrin gum
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WD28 - Wales 9p bluish violet, FCP/PVAD, two 4.75mm B3 phosphor bands (Cyl 2) (Harrison/photo) - Deegam W90.1.1 - S.G specialised XW38 - Stoneham WA37 - Concise W27

Two 4.75mm B3 phosphor bands from cylinder 2 [18.1.78]