Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 2
Lot 615:
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
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