Great Britain 1961 Queen Elizabeth II Wilding. 2d. light red-brown. (2 phosphor bands). Lower marginal block of 8 (2×4). Error, ‘Lower 2 stamps are Imperforate 3 sides ( pair). Also double perforations at foot of top horizontal pair due to horizontal perforation downwards shift’. Superb unmounted mint condition. EXTREMELY RARE AS ONLY 6 MINT PAIRS EXIST.