I saw a Miyata 912 on a bike rake this morning. Beautiful frame. Long point lugs, clean work, business-like squared off dropouts, all the markers of say 1985, perhaps a year or two later. I think the equipment was original so I could have looked more and dated it but I didn't want to attract a lot of attention to it. It looked a lot like the Univega Competition I had briefly a few years ago but I bet this one had lighter, more fun tubing.
I had a Miyata 612 for many years that I rode the heck out of. That bike was a poor fit and just OK serving what i used it for, but ... the build and alignment quality and freedom from defects was way up there.