Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Danzig - Zeppelin Flight - 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