that's a nice frame, looks like the top-of-the-line from back in the '70s: a Cinelli-copy forkcrown and seat cluster, and the perfed BB shell is like one that Nishiki also used. I have read sketchy reports of there being a '70s Cinelli-built Centurion (NOT the Cinelli-Centurion Equipe, which was an '80s deal and has been very well documented), though this is made with early Tange Champion and so would surely have been produced in Japan (or...would it?)
Questions: are those vertical drop-outs labeled Campy, Shimano or (my guess) SunTour?
What size seat post? What BB threading?