Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 446:
1911, 1c green, wet printing, bottom sheet margin block of six, double B lathework under bottom left stamp, natural straight edge at left with a part of arrow at bottom, full OG, NH, fine, Unitrade C.v. CAD$1,100 as block of 4 with lathework and a single with double lathework, Est. $200-$250, Scott #104 var
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