Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 68:
1929 (April 23-25), Mediterranean Sea two Flight covers, both addressed to Chicago, franked by Zeppelin stamp of 2m ultra, tied by board cancel, red confirmation cachet, drop markings of Seville (machine ”24.ABR.29”) or S. Remo (”25.4.29”), mostly VF, Sieger #24d, var, C.v. €450, Scott #C37
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