I can't recall if that was available 30 years ago. But I do recall it was slim pickings if you wanted a high performing 27x1 tire. The Japanese-made Specialized tires were the standard. I believe Avocet offered some very competitive models. For whatever reason back then, other brands weren't considered. (young and pig-headed I guess)
Those of us who chose clinchers rolled on Specialized Turbo/S. And I also ran the wire bead version, the Ultralight, in 27".