Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 290:
1931 (July 12), Vienna Flight cover, franked by five air post stamps, tied by Romanshorn ”11.VII.31” ds, Friedrichshafen ”12.7.31” connection and Vienna the same day special arrival marking, mostly VF, Sieger #116, Est. $100-$120 , Sc. #C6/11
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