Great Britain 1969 Queen Elizabeth II 1s6d British Architecture. SG801a

Great Britain Queen Elizabeth II 1969 1s6d British Architecture, SG801a. Very fine unmounted mint with full original gum block of four with black (face value) omitted. Some light toning as is found on most of the 18 recorded examples. A very rare error and believed to be unique as the only surviving block of four.

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