the stay caps (long and semi-wrap) look very "British", and the BB shell is BSC...but if that 26.2 seat post is the correct size, that's pretty mysterious.
measure and report the ODs of the 3 main tubes, use a digital caliper if you can...metric OD of the 3 tubes will be in even MMs, Imperial dimension tubing will have fractional MMs.
Do the track ends have any stampings (like "Campagnolo") visible? They certainly don't look to be a "stock" pattern, but might be re-worked.