Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 307:
1860, Cents issue, Steamship, plate proof of 12½c in dark blue with horizontal red Specimen overprint (type B), top sheet margin block of four printed on India paper mounted on card, representing interesting jump of Specimen overprint, no gum as issued, VF, Unitrade #10Pii, CAD $280++, Est. $100-$150, Scott #10
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