sw1
FCP = Fluorescent coated paper PVA = Polyvinyl alcohol acetate gum
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SW1 - Scotland 11.5p Mushroom, FCP/PVA, left SA phosphor band (Waddington/litho) - Deegam S115.1.1 - S.G specialised XSL1 - Stoneham SC56 - Concise S36

From cylinders 1A1B, 1A2B, 2A2B, 3A3B, 4A4B, 5A4B, 6A4B, 6A5B, 7A6B [8.4.81]