Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2

Soviet Union 1923-91

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Start price: $600

Buyer's premium:

1976, Caucasus Flowers, 2k, 3k and 4k, imperforate set of three, in addition 3k black engraved color only and 4k in black, blue and magenta, all with side margins, full OG, NH, VF and rare group, Est. $1,000-$1,200, Scott #4506-08 imp, var