Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Germany - Zeppelin Flights - 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