Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1067:
1934, NABA, Zurich Philatelic Exhibition, souvenir sheet of four values 5c, 10c, 15c and 20c, perfect quality, full OG, NH, VF, C.v. $700, Est. $200-$250, Scott #226
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