Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1264:
1959, Mendeleyev Congress, black or red overprints on Butlerov and Mendeleyev stamps, unissued complete set of two, full OG, NH, VF, Est. $1,000-$1,500 , Sc. #1568, 1906 var
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