Great Britain 1938 ½d emerald postage due imprimaturs, SGD27var.
A superb unmounted mint, with full original gum, top marginal imprimatur block of four with "NPM IMPRIMATUR" handstamp on reverse.
Very rare as only three sets in blocks of four, two in pairs and one set of singles were released by the National Postal Museum in 1984/5.
Post Office fresh quality with exceptional provenance.
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