Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1

Lot 32:

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Worldwide Air Post Stamps and Postal History - Canada

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Start price: $170

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Description

1932, blue surcharge ”OTTAWA CONFERENCE” 6(c) on Mercury 5c olive brown, left sheet margin block of six (2×3) with reversed ”1” on the middle row of the edge, full OG, NH, fine, Unitrade C.v. CAD$900, Est. $300-$400 , Scott #C5