Advanced coated paper

ACP = Advanced coated paper

PVAD (Dextrin) = Polyvinyl alcohol acetate dextrin gum
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ac54

AC54 - 10p greyish orange, ACP/PVAD, upright print (Cyls 15, 18) (Harrison/photo) - Deegam 100.14.1 - S.G specialised U189 - Stoneham M389

From cylinders 15, 18 [6.88]
ac56

AC56 - 10p light tan, ACP/PVAD, upright print (Cyl 21) (Harrison/photo) - Deegam 100.15.1 - S.G specialised U194 - Stoneham M390 - Concise X940

From cylinder 21 [4.9.90]

AC56t - 10p light tan, ACP/PVAD, one black horizontal bar training stamp (Harrison/photo)

One black horizontal bar training stamp