South Africa SGO29 10/- Blue and blackish sepia SG type O3 OFFICIAL at LEFT U/M

Official. 1935-49 Set 18 (= 1940 issue) 10/- Blue and blackish sepia SG type O3 opt with OFFICIAL at LEFT lower left corner block of four very fine unmounted. A desirable positional multiple of this key stamp. Ex Matheson. (Union Handbook O90)