Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 501:
1928-29, 1c-$1, complete set of 11 in vertical pairs imperforated horizontally, 20c with left sheet margin, nicely centered with bold colors, full OG, NH, VF and scarce, only 250 sets possible, C.v. $3,870, Unitrade C.v. CAD$5,350, Est. $2,000-$2,400, Sc. # 149e-59c
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