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

Lot 733:

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Soviet Union

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Start price: $150

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Description

1936, Pioneers Helping Post, 3k gray blue, perforation 14, upper sheet margin single imperforate at top, CTO with full OG, VF, this perf error is not mentioned in Specialized catalogs, Est. $300-$350 , Scott #585 var