Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 547:
1879, Dead Letter Office, light brown shade, top sheet margin block of four with B.A.B.N. imprint, some perf separation in the middle, full OG, NH (hinged only in selvage), fine and rare multiple, Green Foundation certificate, Unitrade C.v. CAD$3,000, w/o 3 times premium for plate block, Est. $1,500-$2,000, Scott #OX1
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