Air Mail Proof 1931 (Oct.) 3rd Pan-American P.U.C. Air issue, die proofs of the six values in deep blue on various size pieces of surfaced wove paper, variously initialled and two dated "25/8/31" and "31/8/31" ; some minor creasing and one proof affected by paper clip stain. Photo
Air Mail Proof 1931 (Oct.) 3rd Pan-American P.U.C. Air issue, die proofs of the six values in deep blue on various size pieces of surfaced wove paper, variously initialled and two dated "25/8/31" and "31/8/31" ; some minor creasing and one proof affected by paper clip stain. Photo
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
