Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Germany - Zeppelin Flight - 1929 (September 26), 1st Switzerland Flight cover, franked by five Eagle stamps of 5pf-50pf, on-board ''26.9.1929'' cancellation, Bern the same day arrival ds, VF and scarce, Sieger #35h, €350++, Scott #C27-31