Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Vatican City - Zeppelin Flights - AIRSHIP ''HINDENBURG'' FLIGHT: 1936 (May 5-9), 1st NAF mixed franking cover to USA, bearing by two stamps, tied by ''4.5.36'' Vatican City ds, uprated by two Italian adhesives, Friedrichshafen ''5.5.36'' connection, flight cachet in red (letter ''c'' for Frankfurt), NYC ''May.9.1933'' receiver, mostly VF and scarce, Sieger #406, €700++, Est. $500-$600, Scott #22, 41