pn40e

Fluor shades viewed under long wave light.

OFNP = Optical free non phosphorised paper PVA = Polyvinyl alcohol acetate gum
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PN40E - Northern Ireland 40p grey blue, OFNP/PVA, two 4.5mm Novaglo blue fluor bands (Cyl W1) (Walsall/gravure) - Deegam N400.1.1 - S.G specialised XN53a - Stoneham SLU106 - Concise NI84

Two 4.5mm Novaglo blue fluor bands from cylinder W1 [25.4.00]