1958-65 1D WILDING 'IMPERF (VERTICAL PAIR FROM COIL)' (SG571aa). A fine vertical strip of three 1958-65 1d Wilding with IMPERFORATE VERTICAL PAIR FROM COIL (SG571aa), second and third stamps totally imperforate with part of fourth stamp below, attempted separation by tear between lower two stamps not affecting the variety. A very rare error. Cat. £4500. (Ref 123115).