SOUTH AFRICA, 1950 2p Purple & Slate Blue, Official, Inverted Overprint (O47c; SG O45a).
Block of four consisting of two pairs, Mint N.H., proof-like color and impression on fresh paper, Extremely Fine, a rare block in superb condition, with 2002 B.P.A. certificate, listed but unpriced in Scott, SG value as singles
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