Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Switzerland - Zeppelin Flight - 1929 (November 2), Zurich-Dübendorf Flight Swiss mixed franking stationery postcard 20c carmine, tied by Zurich Luftpost ''2.XI.29'' date stamp, uprated by pair of German Eagle 50pf orange with the same day on-board cancel, black on red Express label, VF, mixed franking item is not listed in Sieger or Michel