South West Africa Postage Due 1972 8c Misperforated Control

POSTAGE DUES: 1972 8c bright blue (SG D64). VF/UM bottom left CONTROL BLOCK (336B) of four with sheet no 25089 GROSSLY MISPERFORATED both vertically and horizontally. Scarce and unusual, nice addition to this otherwise quite bleak issue of just the two values!