I aquired this as a frame set. I added parts I had on hand to make it rideable and it came out pretty nice. It has SunTour dropouts and fork ends so it is likely of Japanese manufacture. No information on model or vintage.
The geometry is definitely racing and very twitchy, much more so than the long wheelbase touring bikes I am used to. Nice big, 64 cm frame size.
Definitely an occasional rider and needs a more comfortable seat.