PPP = Phosphor printed over paper

 PVAD = Polyvinyl alcohol acetate dextrin gum
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1p Crimson
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ppp1
Phosphor printed over paper PPP/PVAD (Harrison/photo)
Upright print from cylinder 12 [10.10.79]

PPP1 - 1p Crimson, PPP/PVAD (Cyl 12) - Deegam 10.11.1 - S.G. U62 - Concise X846 - Stoneham M294
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PPP1 - 1p PPP/PVAD cylinder 12 dot block of 6
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PPP1 - 1p PPP/PVAD cylinder 12 no dot block of 6
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