Lot 746
 
Canada,Semi-Officials, 1925, 25¢ Northern Air Service, First Flight, Unitrade #CL5, canceled Rouyn Lake Jun 27 25 on reverse, single line cachet in violet "First Flight", Haileybury Jun 27 25 cancel ties 3¢ Admiral on front of cover, Fine to Very Fine.
Unitrade C$175, , only 50 exist .
Estimate $100-120.
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