Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 140:
1932 (August 29), International Polar Year, 50k carmine (perf 12) and 1r green (perf 10½), complete set of two used on registered air mail cover from Moscow to USA via Berlin, transit and arrival markings on reverse, VF and scarce complete set franking of non-Polar cover, Est. $250-$300, Sc. #C34-35
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