Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Germany - Zeppelin Flights - 1929 (October 17), Silesia Flight postcard (Graf Zeppelin), franked by two stamps tied on-board ''17.10.1929'' cancellation, the same day Beuthen drop (63 cards flown), in addition card from the same flight but with on-board ''7.10.1929'' ds and Breslau drop, Sieger #43c, 43AI, C.v. €390, Scott #379, C28