I Have a 1979 27' Did they have models back then???

I believe everything was just a Barth back then....the term Classic is used as a model, but I haven't seen a logo a such.....
In the ads of that era, models were designated by their length, i.e.: you've got a model 27.....

The Barth CD's ad reprints are a good source.

The 79 brochure shows only a Barth and a Barth/Iveco.