It may be home made. Is there a hull identification number below the outside rail on the starboard stern? See https://www.usps.org/national/safety/HIN/HIN.pdf for more about interpreting these. Please post a picture if you find one.
Nice looking canoe regardless of origin. If you cannot find an HIN, I'd assume that it's homemade. (Nothing wrong with that either... especially after 40 years)
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I agree with others that this strip canoe was likely home built.