Help me identify this bike

[Tuckervill]

I saw it at a junk shop on the way somewhere. A few hours later, in the dark, I shined (shone?) my headlights on it, only to find I was shining them in some guys living room! But he came out, and looked it over in the headlights, noticed the lugged steel frame and offered the old man $50 for it. It fits, as far as standover, etc.

It's been ridden/made rideable recently, because it has a Wal-Mart saddle and a Slime tube in the front tire. There are absolutely no markings on the frame to indicate who made it--I think it could have been repainted at one point, but it's still hard to tell. Here are the components, in case it helps:

27" wheels
Suntour Sprint front derailleur
Suntour Gt Rear derailleur
Dia Compe brake levers
Suntour downtube shifters (still have the rubber covers)
Nitto Universaide 105 bars
Freewheel I think says Chair and "Made in Japan" on it.
Sunshine quick releases on both wheels.
Looks like the reflectors are new.
Brake calipers are center-pull, but I can find no name on them anywhere (I haven't taken them off, yet.

I intend to do the rustproofing mentioned in the recent vintage bike thread, and will probably repaint.

Pics: