1958-65 6D WILDING ERROR IMPERFORATE AND IMPERF THREE SIDES (SG579a). A very fine unmounted o.g. upper left corner marginal block of ten 1958-65 6d Wilding, upper four stamps totally imperforate, but the next horizontal pair imperforate three sides, the lower block of four normal perforated issue (SG579a). Very minor imperfections on reverse not detracting from this VERY RARE MULTIPLE OF EXHIBITION QUALITY. Cat £13,000. (Ref 123084).