Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 41:
1929 (March 25-28), Oriental Flight cover, franked by three air post values, including 2½ g brown, tied by Danzig ”21.3.29” oval ds, Friedrichshafen ”23.MRZ.2” connection and red confirmation cachet, Istanbul arrival is on reverse, VF, Sieger #23, C.v. €350++, Scott #C26-27, C29
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