Proof -- 18c. Kingsford Smith progressive proof vertical strip of three showing aviator and plane only (missing black and orange), marginal from the left of the sheet. Photo
Proof -- 18c. Kingsford Smith progressive proof vertical strip of three showing aviator and plane only (missing black and orange), marginal from the left of the sheet. Photo
Proof -- 18c. Kingsford Smith progressive proof vertical strip of three showing aviator and plane only (missing black and orange), marginal from the left of the sheet. Photo
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