Bidspirit auction | British North America - New

British North America - New Brunswick - 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 card-mounted India paper, representing interesting jump of Specimen overprint, no gum as issued, VF, Unitrade #10Pii, CAD $280++, Est. $100-$150, Sc. #10