Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 73:
1931 (July 5-6), Upper Silesia Direct and Return Flight postcards, each franked by Zeppelin stamp of 1m carmine, tied by on-board or Glewitz ”5.7.1931” date stamps, violet confirmation and all appropriate markings, arranged on two pages from a Collection, VF, Sieger #115Ab, Ba, C.v. €170 and €200 as premium for franking, Scott #C35
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