Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 40:
1929 (October 16), Balkan and Silesia Flight cover from Sofia to Pforzheim, franked by 6L dark blue and pale lemon, tied by Sofia date stamp, the same day Zeppelin onboard marking, four-line cachet on reverse, mostly VF, Sieger #42-43 var, Est. $400-$500, Scott #202
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