Clamont is the in-house marque of Clarence St Cyclery in Sydney, Australia. The high end and custom frames are built by Geoff Scott, who also builds frames under the Gefsco marque. He is a very highly regarded frame builder in this country and certainly provided frames for the Australian Institute of Sport (AIS.) He is still making frames to this day.
Here's a good article:
https://veloaficionado.com/blog/shoo...-frame-builder