28p values

PCP = Phosphorised coated paper

PVAD (Dextrin) = Polyvinyl alcohol acetate dextrin gum

ACP = Advanced coated paper  
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pc140_ac153

Bluish violet

PC140 - 28p bluish violet, PCP1/PVAD, upright print (Cyl 1) (Harrison/photo) - Deegam 280.1.1 - S.G specialised U307 - Stoneham M342 - Concise X975

PCP1 matt paper from cylinder 1 [30.3.83]

AC153 - 28p bluish violet, ACP/PVAD, upright print (Cyl 1) (Harrison/photo) - Deegam 280.2.1 - S.G specialised U308 - Stoneham M420

Advanced coated paper from cylinder 1 [7.10.86]
ac154

AC154 - 28p sand, ACP/PVAD, upright print (Cyl 4) (Harrison/photo) - Deegam 280.3.1 - S.G specialised U309 - Stoneham M421 - Concise X976

From cylinder 4 [23.8.88]
ac155

AC155 - 28p slate blue, ACP/PVAD, upright print (Cyl 4) (Harrison/photo) - Deegam 280.4.1 - S.G. U310 - Stoneham M422 - Concise X977

From cylinder 4 [10.9.91]