Bidspirit auction | Worldwide Pioneer Flights - Denmark

Worldwide Pioneer Flights - Denmark - 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