Proof  -- 18c. Kingsford Smith progressive proof vertical strip of three in blue and pink; one with small surface fault at right. Photo
Proof -- 18c. Kingsford Smith progressive proof vertical strip of three in blue and pink; one with small surface fault at right. Photo

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Proof -- 18c. Kingsford Smith progressive proof vertical strip of three in blue and pink; one with small surface fault at right. Photo