sd1_3_4
OCP = Original coated paper PVA = Polyvinyl alcohol acetate gum
FCP = Fluorescent coated paper
!

SD1 - Scotland 2.5p Magenta, OCP/PVA, 4mm screen 150 phosphor centre band (Harrison/photo) - Deegam S25.1.1 - S.G specialised XS29 - Stoneham SC26 - Concise S14

From cylinder 2 [7.7.71]

SD3 - Scotland 2.5p Magenta, FCP/ARABIC, 4mm screen 250 phosphor centre band (Harrison/photo) - Deegam S25.2.1 - S.G specialised XS30 - Stoneham SC30 - Concise S14Eg

From cylinder 2 [22.9.72]

SD4 - Scotland 2.5p Magenta, FCP/PVA, 4mm screen 150 phosphor centre band (Harrison/photo) - Deegam S25.3.1 - S.G specialised XS31 - Stoneham SC32

From cylinder 2 [.6.73]