Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 188:
1929 (December 15), Pioneer Ad Astra Aero Pioneer Flight to Khartoum, stationery postcard 20c red, uprated by three stamps, including the Mythen 3fr red, boxed confirmation cachet and arrival ds is alongside, mostly VF, Est. $100-$150, Sc. # 182, C7 x2
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