Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 1049:
1928 (October 11-15), America Flight cover franked by left sheet margin horizontal pair of Airplane over Danzig 2½g, tied by oval ”4.10.28” date stamp, blue oval confirmation marking and NYC ”16.OCT.1928” receiver, VF and scarce, Sieger #21, C.v. €650 w/o a premium for franking, Scott #C30 x2
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