Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 71:
1932 (May 17), Pioneer Flight registered cover Sofia – Paris, franked by air post complete set of three, tied by Sofia ”17.V.32” special ds, postmarked on arrival, mostly VF, Est. $100-$150, Sc. # C12-14
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