South Africa 1929-31 Official 6d green and orange SGO9/a/b

South Africa Official. 1929-31 6d green and orange, Pretoria typo printing with type O2 overprint, lower right corner block of 8 (2x4) from 1930 printing, showing stop after 'OFFISIEEL' on R18/12 (English) and R19/12 (Afrikaans), fresh original gum. (mostly unmounted, including lower variety pair). A desirable positional piece. Official. SG O9/a/b

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