Vintage 1970s Butte Knit jacket with contrast stitching

This is a little piece of history! Union-made coat from Canadian brand Butte Knit. Lovingly preserved. No size or fabric tag, but compares to a size medium. See approx flat measurements below. Guessing this is a polyester knit, because #70s but I could be wrong. Flat measurements: Sleeve length: approx 22” (it’s a bit of a dropped shoulder) Pit-pit: approx 20” Shoulder-hem: approx 30”