Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 115:
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
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