Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1199:
1938, Papanin’s North Pole Expedition, 50k ultra, horizontal imperforated pair with nice margins, which are enlarged at top and bottom, full OG, two light traces of hinge, VF and very scarce, C.v. $2,350, Est. $1,000-$1,500 , Sc. #646a
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