Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Canada - 1926 (September 30), Patricia Airways (50c) dark violet and red on blue paper, used together with Admiral stamp of 1c in horizontal pair on Pioneer Flight cover from Birch Lake to Sioux Lookout, appropriate markings, VF, Unitrade C.v. CAD$300, Est. $100-$120, Scott #CL18