Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 223:
Description
1860, Steamship, imperforate plate proof of 12½c in dark blue, block of four printed on India paper and mounted on card, horizontal red ”Specimen” overprint, types C, penciled positions 75-76/85-86 on reverse, no gum as produced, VF, Unitrade #10Piii, C.v. $280++, Est. $150-200, Scott #10
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