Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 328:
1865, Harp Seal, imperforate plate proof of 5c in brown and horizontal pair of trial color proofs of 5c in claret brown, printed on India paper, first one card mounted with minor facial scratch, no gum as issued, VF, Unitrade #25P, 25TC, C.v. CAD$300, Est. $80-$100, Scott #25
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