Was it this one? Sorry it’s a ravelry link.
https://www.ravelry.com/patterns/library/double-knit-folkloric-afghan
Published in McCall’s Design Ideas Vol. 8, Afghans and Coverlets to Knit, Crochet
Maybe you can find it on ebay?
You are amazing. It’s very very close. I was pretty sure it was McCall’s magazine. 1986.. what a long time ago.