Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 65:
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
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