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Great Britain 1937 1d Postage Due Imprimaturs, SG D20var

SKU JP5212

Great Britain 1937 1d Postage Due, SGD20var.

Very fine unmounted mint with full 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 the Smithsonian National Postal Museum archive sale.

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