Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 1177:
1933 (May 29-30), Italy Flight postcard to Friedrichshafen, franked by two values, cancelled ”28.5.33” at Vatican, uprated by Italian Zeppelin stamp of 3L, tied by machine Rome ”29.5.33” ds, blue flight cachet, green Friedrichshafen ”30.5.33” special Zeppelin marking, VF and scarce, Sieger #208 Vh, €750, Est. $600-$800, Scott #10, 14
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