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

Soviet Union 1923-40

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Start price: $750

Buyer's premium:

1935, Moscow Subway, trial color imperforate proof of 10k in carmine rose, enlarged margins at three sides, full OG, NH, VF and rare, Est. $1,500-$2,000, Scott #552