Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 467:
1932-38, Perkins and Bacon Definitive issue, trial color imperforated proofs of 5c (die I), 15c, 24c, 25c and 48c in horizontal or vertical pairs, a single defaced proof of 6c with left margin, all 21mm wide or height, printed on paper without watermark, no gum as produced, NH, VF, NSSC #182ae/93c, C.v. US$2,680, Est. $500-$600, Sc. # 190/99
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