Great Britain 1912 ½d Green (Watermark Multiple Cypher), SG346.
A very fine unused, with original gum, bottom left hand corner marginal "B.12" control strip of three perforations type 2A.
An extremely rare King George V control block from the Somerset House printing.
GB Specialised Catalogue No: N6(1).
Accompanied with a 1971 Royal Philatelic Society (RPS) Certificate of Authenticity.
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