SOUTH AFRICA 1926 6d green and orange Official, variety, SGO4varSouth Africa 1926 6d green and orange Official, overprint type O1 (with stops), horizontal pair (London printing), showing overprint misplaced 4 5mm downwards resulting in partial "O" of "OFFICIAL" appearing in top perforation, SGO4var. A fine mint pair with original gum. Some very faint gum yellowing, which is common and still of very fine appearance. A rare Union of South Africa issue of the "Orange Tree", especially with this variety. The Stanley