Great Britain 1855 1d red brown Plate 25, (Neal's Steam Press Experimental Printing) SG29a.
A very fine and fresh unused imperforate block of four lettered 'GK-HL'. A lovely multiple without any of the usual heavy creasing as normally seen on this failed experimental printing.
Very rare as only a half sheet of imperforate stamps from the different shade of plate 25 exist, with most being in poor condition.
GP Specialised Catalogue No: C8(1)h.
Accompanied with a 1985 Royal Philatelic Society (RPS) Certificate of Authenticity.
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