History of Aviation, Rare Stamps and Postal History of the World, Part 1
Lot 42:
1912 (July 29), Demonstration Flight at Hareskov, cover to Copenhagen, franked by four definitive stamps, boxed ”Hojsommerfesten. I Hareskov 1912.” confirmation and oval merchant’s markings in violet, VF, Est. $100-$150 , Sc. #57 x2, 59, 72
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