Originally Posted by
Bikedued
Just found this today, and have no idea what it might be? Long pointed lugs with heart cutouts, Shimano drops, hardly any braze ons at all.
Lots of bikes used those Shimano SF dropouts -- mostly Japanese, but Trek also used them and I've seen them on some British and European bikes from the early 80s as well.
If I were to guess, I'd say it's a mid-level Japanese built frame.