Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 76:
1933 (June 20), Two Short Flights to Switzerland, cover franked by two stamps, including Zeppelin 1m carmine, tied with on-board ”20.6.33” cancel, ”Mit Luftschiff ”Graf Zeppelin” line confirmation marking, VF and scarce, Sieger #0216 I, C.v. €250 plus €100 as a premium for franking, Scott #C35
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