wd23
FCP = Fluorescent coated paper PVAD = Polyvinyl alcohol acetate dextrin gum
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WD23 - Wales 7p brown, FCP/PVAD, 4mm B3 phosphor centre band (Cyl 1) (Harrison/photo) - Deegam W70.1.1 - S.G specialised XW34 - Stoneham WA34 - Concise W23

4mm B3 phosphor centre band from cylinder 1 [18.1.78]