Originally Posted by unworthy1

It does have a certain "Holdsworth" vibe, but not certain, especially with the long Campy DOs the plastic under-BB guide and TT guides. Those are details that indicate a late-70s transition period, or an earlier frame that's been modified with later braze-ons. Oddest thing is what appears to be a "Dutch style" one-sided pinch bolt, but it's opposite from normal (would have the Allen head on the RH side). Are both brake mounts unmodified recessed Allen-bolt? Sure would seem like a later frame than should have the long Campy 1010A DOs, maybe THOSE are the later additions.
And last: 3-digit serial number definitely NOT typical Holdsworthy...