So I was looking in the glove box of the reliant and I found the original manual (which I knew was there). But I also found the original warranty card, all filled out by the original owner circa 1987.
Turns out it was bought new at J.J. Stewart Motors Ltd. in Norwood, so that mystery is solved. The original owner was Marie Teunissen of Hastings, Ontario. Neat! If anyone knows Marie or her family, tell them I have her former car!
Also I gave the car a much needed soapy bath today to get it all cleaned up and see what was under all the dirt. Turns out, it’s not too bad, except the rockers and underside, and some wheel well issues.