If I had to put money on it, I would vote Superior.

There are a few non-Superior details.

The cable routing for the rear brake originally went under the TT, with no braze-on cable guides.

The cable-stop for the rear derailleur cable is not original.

Fender eyelets are missing front and rear, the fork does look like a Tange, but it could be aftermarket.

Looks like shifter braze-ons were added as well.

I'd guess the frame was modded whrn the repaint happened. Odd that a second set of bottle mounts were not added.

Superiors are awesome! I have an Orange '81 that I love.

EDIT: Adding a pic...