Great Britain 1956 3d violet Postage Due (Watermark St Edwards Crown) imprimatur, SGD50var

Great Britain 1956 3d violet Postage Due (Watermark St Edwards Crown), SGD50var.

A superb unmounted mint, with full original gum, imperforate imprimatur with "N.P.M. imprimatur” handstamp on reverse.

Very scarce, one of only five examples released from the National Postal Museum archive sales.

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