South Africa 1926-27 ½d black and green SG30a

South Africa 1926-27 ½d black and green, London printing, right marginal vertical pair, lower stamp showing the error missing "1" in "½" (position noted as R7/12 in pencil on reverse of margin), fine large part original gum, (error unmounted). A major rarity. Accompanied with Philatelic Federation South Africa (PFSA) certificate (1989). Unmounted Mint. SG 30a

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