Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Canada - 1930, Mercury, 5c olive brown, left sheet margin block of six (2x3) with reversed ''1'' on the middle row of the edge, full OG, NH, F/VF, right stamps are VF, left ones with enlarged margin at right and balanced margins at three other sides, counted as fine, Unitrade C.v. CAD$1,100, Est. $600-$700, Scott #C2