Description
Great Britain 1912 ½d green (Die 2, Watermark Simple Cypher), SG344var.
A very fine unused B12(c) corner marginal control block of six, with original gum, overprinted "SPECIMEN" type 26 from the Harrison colour standard sheet.
A very rare specialised philatelic piece.
GB Specialised Catalogue No: N5(1)s
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