Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 542:
1915, black diagonal overprint ”War Tax” on 20c olive green, block of four, nicely centered, full OG, NH (bottom stamps) or hinged, VF, Unitrade #MR2C, C.v. CAD$1,800 as singles, Est. $350-$400
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