wd50
PCP = Phosphor coated paper PVAD = Polyvinyl alcohol acetate dextrin gum
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WD50 - Wales 16p pale mushroom, PCP/PVAD, perforation 13.75 X 14 (Questa/litho) - Deegam W160.1.1 - S.G specialised XWL13 - Stoneham WA51 - Concise W43

Perforation 13¾ X 14 from cylinders Q1, Q2, Q3, Q4 [27.4.83]

WD51 - Wales 16p pale mushroom, PCP/PVAD, perforation 14.75 X 14 (Questa/litho) - Deegam W160.1.2 - S.G specialised XWL14 - Stoneham WA69 - Concise W43a

Perforation 14¾ X 14 from cylinders Q3, Q4, Q5, Q6 [10.1.84]