FCP = Fluorescent coated paper PVAD = Polyvinyl alcohol acetate dextrin gum
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sd38

SD38 - Scotland 11p Pastel red, FCP/PVAD, two 4.75mm phosphor bands (Harrison/photo) - Deegam S110.1.1 - S.G specialised XS55 - Stoneham SC52 - Concise S32

From cylinder 1 [20.10.76]
phosphor_omitted

SD38mp - Scotland 11p Pastel red, FCP/PVAD, phosphor omitted (Harrison/photo) - Deegam S110.1.1a - S.G specialised XS55a - Stoneham SC52a - Concise S32Ey

From cylinder 1