Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 1138:
1931 (May 15 and June 8), two covers to Germany and USA, franked by complete imperforate and perforated Airships sets, 10k-1r, appropriate markings, the last one with slight fold away from the stamps, mostly VF, Est. $300-$400, Scott #C15-19, C20-24
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