Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 533:
1876, 5c dark green, top sheet margin block of six with full imprint and reversed ”R” indicating this block was printed from the re-entered plate I, full OG with some perf reinforced vertically at left, one stamp is NH, fine and rare multiple, Unitrade C.v. CAD$900 as singles, Est. $300-$400, Scott #F2
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