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

Lot 716:

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Soviet Union

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Start price: $160

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Description

1930, Educational Exhibition, 10k olive green, ”o” above date variety at the bottom inscription (position 10), top right corner sheet margin single, full OG, NH (LH on top margin), VF and scarce, Est. $300-$400 , Scott #435 var