Great Britain 1937 1d Postage Due. SG D20var
Great Britain 1937 1d Postage Due. Very fine unmounted original gum top marginal block of four imperforate imprimaturs with 'NPM IMPRIMATUR' hand stamped on reverse. very rare, this magnificent multiple contains four of the six examples released from theSmithsonian National Postal Museum archive sale. SG D20var
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