Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 141:
1933, ”Stratostat USSR 1”, 5k, 10k and 20k, three covers franked by these stamps, the first one sent from Moscow to Stalingrad, second one – locally sent in Moscow, the last one – from Baku to Kashira (Moscow Obl.), mainly VF, Est. $300-$400 , Sc. #C37-39
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