Paper varieties viewed under long wave light.
PDP numbers are the copyright of the MBPC and are used with their permission.
BCP = Bluish coated paper PVA = Polyvinyl alcohol acetate gum
OCP = Original coated paper
!

P38, P40 or P43 - 3d violet (Shades), BCP/Arabic, 4mm screen 150 B3 phosphor centre band, head A1, upright print (Cyl 1)
!

P38 Dull violet shade from sheets cylinder 1 [18.8.67] - Deegam PD 4.1.1 - S.G specialised U8 - Stoneham M3 - Concise 729
P43 Phosphor omitted - Deegam PD 4.1.1a - S.G specialised U8b - Stoneham M3a - Concise 729Ey

P40 Deep violet shade from sheets cylinder 1 [18.8.67]

P44 - 3d violet, BCP/Arabic, 4mm screen 150 B3 phosphor centre band, head A1, upright print (Vertical coil) - Deegam PD 4.1.2
!

4mm B3 phosphor centre band, head A1 from vertical coil [18.8.67]

P46 - 3d violet, BCP/Arabic, 4mm screen 250 B3 phosphor centre band, head A1, sideways print left (Horizontal coil) - Deegam PD 4.2.1 - Stoneham M3b
!

4mm B3 phosphor centre band. head A1 from horizontal coil [2.10.67]

P48 3d violet, OCP/Arabic, 4mm screen 250 B3 phosphor centre band, head B2, sideways print left (Multi value coil) - Deegam PD 4.2.2 - Stoneham M4
!

4mm B3 phosphor centre band, head B2 from GS/GL multivalue coils [27.8.69]

P50, P50mp, P51 or P51d - 3d Violet (Shades), BCP/PVA, 4mm screen 150 B3 phosphor centre band, head A1, upright print (Cyls 1, 3)
!

P50 Violet shade from sheets cylinder 1 [12.3.68] - Cylinder 3 [?.5.68] - Deegam PD 4.3.1 - S.G specialised U9 - Stoneham M20 - Concise 729Ev
P50mp Phosphor omitted from sheets cylinder 1 - Deegam PD 4.3.1a - S.G specialised U9a - Stoneham M20a - Concise 729Evy

P51 Dull violet shade

P51d Deep dull violet shade

P54u or P54i - 3d violet, BCP/PVA, 4mm screen 150 B3 phosphor centre band, head B2 (PDP3) - Stoneham M21
!

P54u Upright print, screen 150 B3 phosphor band from booklet pane PDP3 [25.3.68] - Deegam PD 4.3.2
P54 Inverted print, screen 150 B3 phosphor band - Deegam PD 4.3.3

P64 or P66 - 3d violet, BCP/PVA, two 4.75mm screen 250 B3 phosphor bands, head B2 (PDP4/A) - S.G specialised U10 - Stoneham M23b
!

P66 Sideways print left from booklet panes PDP4/A [6.4.68] - Deegam PD 4.5.1
P64 Sideways print right - Deegam PD 4.5.2

P62 - 3d violet, BCP/PVA two 4.75mm screen 150 B3 phosphor bands, head A1, upright print (Vertical coil) - Deegam PD 4.6.1 - Stoneham M22a
!

Two 4.75mm B3 phosphor bands, head A1 from AD vertical coil [26.9.68]

P60 - 3d violet, BCP/PVA two 4.75mm screen 150 B3 phosphor bands, head A1, upright print (Cyls 3, 4) - Deegam PD 4.6.3 - S.G. U10 - Concise 730 - Stoneham M22
!

Two 4.75mm B3 phosphor bands, head A1 from sheets cylinder 3 [20.8.69] - Cylinder 4 [?.10.69]