Almost forgot. Looks like a 24-1/2" frame.

Looking closer, and accounting for your report that it might have been silver originally, I'd consider the Reliant to be a possibility.

Here's the link to where I took a look at the models for 1979 and 1981 (1980 catalog has eluded my eyes).

https://www.kurtkaminer.com/bikecollection.html

And the catalog images.