Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - United States - Canal Zone - Zeppelin Flight - 1930 (May 31-June 6), Return South America Flight mixed franking postcard from Cristobal and Havana to Germany, franked by three air post values, tied by ''MAY 15. 1930'' ds, Havana machine hs on reverse, upon arrival to NYC uprated by Zeppelin 65c green and cancelled on May 27; German and American (type II) flight markings, Friedrichshafen ''6.6.30'' receiver, VF and very rare, PF certificate, Sieger #64 III var, C.v. €1,600++, Est. $1,500-$1,800, Scott #C1, C3, C4