Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 548:
1879, Dead Letter Office, deep brown shade, block of four, full original gum with small natural creases, F/VF and rare nicely centered multiple, Green Foundation certificate, C.v. $2,200 as singles, Est. $500-$600, Scott #OX1 var
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