OFFICIALS: 1950 2d blue & violet, Type 7 ovpt, OVERPRINT INVERTED (SG O45a). A Superb UM block of four. Fresh, bright colour. Amongst the most important stamps of the South African Official issues. A rare & exceptional block. Photo-cert: PFSA (1987, as then #O38a). (cv£2200+). See additional image and of certificate below.
