Its either a Centurion or a Wheeler inmho. Both were fabricated in the far east. Some details differed from brand to brand and model to model of course.
I might be going totally mad of course, but I'm leaning more toward Wheeler than Centurion, I think even the 94 model elevator had different rear dropouts, whilst Wheeler used this design and the cable guides. I have a Wheeler with the same cable guides for sure, but a conventional diamond frame, not estay.