Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 145:
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, Est. $150-$200
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