FCP = Fluorescent coated paper PVAD = Polyvinyl alcohol acetate dextrin gum
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wd12

WD12 - Wales 3.1/2p grey green, FCP/PVAD, two 4.75mm B3 phosphor bands (Cyl 2) (Harrison/photo) - Deegam W35.1.1 - S.G specialised XW26 - Stoneham WA28 - Concise W16

Two 4.75mm B3 phosphor bands from cylinder 2 [23.1.74]
wd13

WD13 - Wales 3.1/2p grey green, FCP/PVAD, 4mm B3 phosphor centre band (Cyl 2) (Harrison/photo) - Deegam W35.2.1 - S.G specialised XW27 - Stoneham WA29 - Concise W17

4mm B3 phosphor centre band from cylinder 2 [6.11.74]