Eagle Hand Knit Wool Sweater

I am not an anthropologist so am unable to confirm at this time if it is an authentic Cowichan knit. Similarities to a modern day authentic Cowichan is design, natural, undyed wool. The unknown for me is the water wave motif. Truly authentic Cowichan sweater do not have zippers nor seams, but modern day authentic Cowichan sweaters do. Thick and sturdy YYK zip Good vintage condition. Shows signs of age with some loose loops and minor marks and wear but no holes, rips, smells. Black and white images from https://journals.lib.unb.ca/index.php/mcr/article/view/21406/24805 to show similarities of the pattern. I highly encourage anyone interested in Cowichan sweater authentication to read the article. Would love to hear your comments about authenticity below!