Great Britain 1968 Northern Ireland 1s6d grey-blue imprimatur, SGNI11var

Great Britain 1968 Northern Ireland 1s6d grey-blue (2 bands) imprimatur, SGNI11var.

A very fine unmounted mint, with full original gum, left hand marginal imperforate imprimatur with NPM handstamp on reverse.

A scarce imprimatur from the first approved printing sheet as only two singles and two blocks of four were released by the National Postal Museum.

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