Assos tubular rims

Good call, bars and dropouts match, and Gisiger being Swiss would likely have had links with Assos even though his clothes say LeJeune
http://gs-guccilife.blogspot.com/2010/01/bring-it.html

Right, thanks, that was the visual association my memory served up. Looks like a lugged steel frame though, not carbon. Could be anything.

Tony Doyle's '85/'86 Eddy Merckx branded pursuit frame was built by Chas Roberts, for example. Pretty common then.