Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Vatican City - Zeppelin Flights - 1933 (May 29-30), Italy Flight mixed franking postcard to Friedrichshafen, bearing two values, cancelled ''28.5.33'', uprated by Italian Zeppelin of 3L, tied by circular Rome ''29.5.33'' ds on front, Rome machine marking with the same date is on reverse, blue flight cachet, green Friedrichshafen ''30.5.33'' special Zeppelin receiver, mostly VF and scarce both types of Rome postmarks on one item (not priced in the Cat.), Sieger #208 Va/Vh, Est. $500-$600, Scott #10, 14