SOUTH AFRICA 1935-49 ½d grey and green Official, SGO20South Africa 1935 49 d grey and green Official, WATERMARK INVERTED, lower right corner block of 6 (2x3), SGO20. A fine and fresh unmounted mint positional block with full original gum, (hinged in margins only). A very scarce positional multiple of this inverted watermark printing variety. The majestic image of the South African antelope, the "Springbok" has captured the hearts of collectors for generations making these stamp issues one of the most