Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 23:
1925, Airship (Z.R.3) Los Angeles Direct and Return Flights to Puerto Rico, five covers, one for direct and four different for return flight, cancelled at San Juan or Mayaguez, bearing different types of confirmation markings, in addition two covers delivered by Graf Zeppelin on different legs of Around the World Flight of 1929, arranged on pages from a Collection, mostly VF, Sieger #20U, T, V, W, 28-29, C.v. €1,100
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