Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 487:
Description
1913, Dead Letter Office, imperforate plate proof in brown black, printed on card mounted India paper, nice margins all around, no gum as issued, VF, Unitrade C.v. CAD$800, Est. $300-$400 , Scott #OX4
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