Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - United States - Zeppelin Postal History - Group - 1928-36, 12 covers or postcards, representing United States - Germany flight of 1928 (5), First Round the World Flight of 1929 (3), Century of Progress Flight of 1933 (1) and Hindenburg 1st North America Return Flight (3), variety of franking, flight cachet and postal markings, one cover has conveyance faults, others F/VF or better, Est. $300-$350