Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 47:
1930, Columbia Flight, black surcharge 50c on Caribou 36c olive green, full OG, very light trace of hinge (appearing NH), almost VF and rare, only 300 stamps were surcharged, at least a half of them were used, K. Lissiuk guarantee hs, C.v. $9,000, Est. $5,000-$6,000, Sc. #C5
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