Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 152:
BALANCE OF FLIGHT COVERS: 1927-39, the Hague Air Post Conference on cover to Latvia, Attempt Flight Franz Josef Land to Arkhangelsk, cover from Kiev to Berlin franked by North Pole Flight issue and two high franking covers with Aviation Exhibition and other valuable stamps addressed to Sofia and Prague, appropriate markings, mostly F/VF, two with I. Kirzhner certificates, Est. $200-$300, Sc. #C10-11, C34, C69/73
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