Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1199:
Description
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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