Canada 1926 Patricia Airways Style I Semi-Official Airmail Cover Pine Ridge

Cover, franked with 4c Admiral, affixed on back Patricia Airways & Exploration Co., Style One, to Sioux Lookout first flight cover, the semi-official with Style One "RED LAKE / AIR MAIL" trial first printing overprint ("RED LAKE" measures 15.5mm wide instead of 20mm.), tied by Pine Ridge P.A. & E. company datestamp and Sioux Lookout c.d.s (JUL 8), signed by pilot Harold Anthony "Doc" Oaks, very fine. (Unitrade CL13 trial, AAMC CL13-trial, AAMC CL13-trial 2602c)