Great Britain 1914 1d Carmine (Watermark Sideways inverted) Postage Due, SGD2var.
Very fine unmounted mint with full original gum bottom right hand corner marginal block of eight (three stamps only lightly mounted in top row) showing watermark "POSTAGE" inverted on bottom four stamps and a second "POSTAGE" printed upright in sheet margin at foot.
Very rare watermark variety.
GB Specialised Catalogue No: R2.
Accompanied with a 2013 Royal Philatelic Society (RPS) Certificate of Authenticity.
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