Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 202:
1933 (May 29-30), Italy Flight cover to Friedrichshafen, franked by two values, cancelled ”28.5.33”, uprated by Italian Zeppelin stamp of 5L, which tied by machine Rome ”29.5.33” date stamp on front, the same Rome machine marking is presented on reverse, blue flight cachet, green Friedrichshafen ”30.5.33” machine arrival postmark, VF and scarce, Sieger #208 Vi, €850, Est. $600-$800, Scott #11, 14
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