Owned a limited production C'dale in early 80s. They built 150 of them; believe model number was either 1200 or 1500.
It had a small decal on top tube stating: No.6 out of 150 on it. It was in the days of fairly heavy, and ugly, TIG welds and this frameset had all the heavy welds hand-filed down real smooth. Came in only one color, a nice pale metalic-type blue, exept one of the bikes was painted black at buyers request. It was sold as a frameset only.
Built it up nicely with then top-o-the-line components.
Early C'dales were identified by number, with the 400 being the least expensive.
They also produced their first mountain bikes with a strange wheel choice: 26" wheel on the front and a 24" inch wheel on the back. Believe that was only done for one year.
Also we test rode one of the 2 C'dale prototype tandems for 3 months, 2 years before the official unveiling of their tandem. The first couple years, the tandems were sold as road framesets only.

Rudy and Kay/Zonatandem