ACP/PVAD
DP numbers are the copyright of the MBPC and are used with their permission.

ACP = Advanced coated paper

 PVAD = Polyvinyl alcohol acetate dextrin gum
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PC18 - 1p Crimson, ACP (Experimental coating)/PVAD, low set value, upright print (Cyl 12) (Harrison/photo) - Deegam 10.13.1 - S.G. specialised U63 - Stoneham M368
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ACP (Experimental coating), low set value from sheets cylinder 12 [?.7.83]

AC1 - 1p Crimson, ACP/PVAD, low set value, upright print (Cyl 12) (Harrison/photo) - Deegam 10.13.2 - S.G. specialised U64 - Stoneham M369
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Low set value from sheets cylinder 12 [?.4.84]

AC6 - 1p Crimson, ACP/PVAD, high set value, upright print (Cyl 14) (Harrison/photo) - Deegam 10.13.3 - Stoneham M370
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High set value from sheets cylinder 14 [7.1.86]

AC3 - 1p Crimson, ACP/PVAD, sideways print left (SC1 horizontal coil) (Harrison/photo) - Deegam 10.13.4 - Stoneham M371
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From SC1 horizontal coil [23.6.87]

AC2, AC2a or AC2ls - 1p Crimson, ACP/PVAD, screened value, sideways print left (RD3 coil) (Harrison/photo)
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AC2a Non screened value from RD3 multivalue coil [?.2.88] - Deegam 10.13.5
AC2 Heavily screened value - Deegam 10.13.5a - Stoneham M372
AC2ls Lightly screened value

AC4 - 1p Crimson, ACP/PVAD, high set value, upright print (Vertical coil) (Harrison/photo) - Deegam 10.13.6 - Stoneham M374
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High set value from QL1 vertical coil [26.7.88]

AC7 - 1p Crimson, ACP/PVAD, non screened value, upright print (Cyls 15, 17) (Harrison/photo) - Deegam 10.13.7 - Stoneham M373
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Non screened value from cylinder 15 [?.9.88] - Cylinder 17 [?.3.90]

AC13 - 1p Dark maroon, ACP/PVAD, upright print (Cyl l7) (Harrison/photo) - Deegam 10.19.1 - S.G. specialised U64
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Dark maroon shade from sheets cylinder 17 [?.2.91]

AC14 - 1p Dark maroon, ACP/PVAD, sideways print right (DP173) (Harrison/photo) - Deegam 10.19.2
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Dark maroon shade from booklet pane DP173 [10.9.91]

AC1t - 1p Crimson, ACP/PVAD, two vertical bars trining stamp
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Two black vertical bars training stamp from sheets cylinder 12 [?.12.84]