cover 1930, Zeppelin flight cover, cacheted Zeppelin flight cover (South America Flight) from Rio de Janeiro to Switzerland on special CONDOR printed envelope, franked with 500r Ultramarine (308) and three Graf Zeppelin adhesives (RHM nos. Z2-Z4), tied by CONDOR 24 MAI 30 special flight cachets, purple Zeppelin flight cachet, very fine not illustrated est.