Seat tube (centre of BB shell to top of seat tube): 63cm. Down tube (centre of BB shell to centre of head tube): 63cm. I'm guessing 'Nimbus' was his own creation, can't find any reference online. I was sceptical about the Columbus Max decal, I double checked the specification (copied below at the end) and the top tube, down tube and seat tube all have the elliptical cross-section tubing so safe to say it’s genuine.
