Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 1100:
1931 (March 28-30), Hungary Direct and Return Flight postcards, franked by two or three air post values, including Zeppelin overprint on 1p orange, two different confirmation markings in blue or green, Budapest or Friedrichshafen receivers of March 29 or 30 respectively, VF, Sieger #102Aa, Ba, C.v. €300, Scott #C24
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