Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1263:
Description
1958, Mendeleyev Congress, blue or red overprints on Butlerov and Mendeleyev stamps, the last one with top sheet margin, unissued complete set of two, full OG, NH, VF, Est. $900-$1,200 , Sc. #1568, 1906 var
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