Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Guatemala - Zeppelin Flight - 1936 (May 11-14), 1st North America Airship ''Hindenburg'' Return Flight mixed franking cover from Guatemala, franked by six stamps, including four air post values, upon arrival to US uprated by three adhesives, special machine ''2.MAY.36'' ds, violet American flight cachet, Frankfurt ''14.5.36'' receiver, VF and rare, Sieger #409P, C.v. €1,650, Est. $700-$800, Scott #C48-49, C54