I built this fillet brazed 650 road bike for a friend about 20 years ago. It is a signature edition of the 'Langostino"-that's what I called the smaller wheeled road frames for a couple of years. The internal brake cable and singular seat collar are touches that I did back then.
As the sticker says, the frame really is made of Columbus EL OS tubing, some of the earliest oversize Nivachrom tubes. I think I built this one in my garage shop that I had from 1982-1992.
The King headset is old enough that it does not have the logo on the cups.
I was putting a lot of Kestrel forks on my bikes back then. The Kestrel was the first really popular carbon fork.