Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 71:
1931 (May 13), Baltic Sea Flight postcard on leg Friedrichshafen-Berlin (Round Flight), franked by Zeppelin stamp 1m carmine, tied with on board ”13.5.1931” ds, ”Un Bord des L.S. ”Graf Zeppelin” two- line confirmation marking in blue (no violet confirmation), VF and scarce, Sieger #108, Est. $150-$200, Scott #C35
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