I'm quite pleased that the guy in Portugal is pumping me for info . if only because l am discovering references which are new to me ...for example :
AMR "CAMUS" Tubing catalogue 1985
CAMUS tubes were developed and marketed by Ateliers de Maison Rouge -AMR-, of Tonnerre to the NE of Paris, by a small team directed by Christophe Liebert - it is Christophe himself, out-of-the-saddle - on the cover of the catalogue. I think its called product testing!
The tubes were all plain gauge seamed products, and of varying weights..and shapes. They were extremely easy to work and brazed and welded readily . The alloy steels used were less technically complicated more predictable and less demanding than many of those of their their competitors.
The company was the first to introduce sets of aero tubes with round ends that could be used with lugs, - the Force7 and Force8 sets and it was also the first to introduce a full low-profile set with curved seat and top-tubes and aero section for all the other tubes- the CAMUS 789. All tubes were available on a mix and match basis.
The numerals in the names of the sets indicate the gauges of the tubes used.
The series of tubes were very popular with many custom builders, as they facilitated the production of unusual and often avantgarde frames at very reasonable cost.