Proof 1931 (Oct.) 3rd. Pan-American P.U.C. Air, die proofs of the six values in black on three pieces of wove paper, one piece with creases clear of impressions, all three marked "For Hardening" , initialled and dated
Proof 1931 (Oct.) 3rd. Pan-American P.U.C. Air, die proofs of the six values in black on three pieces of wove paper, one piece with creases clear of impressions, all three marked "For Hardening" , initialled and dated
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.jpg "Quelle: Christie's")
.jpg "Quelle: Christie's")
