Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3

Soviet Union Stamps of 1924-40

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Start price: $300

Buyer's premium:

1935, Mikhail Kalinin, 20k black brown, imperforated single with nice margins all around, large part of OG, VF, C.v. $1,500, Est. $500-$600 , Sc. #576a