On this French bike you can see a number of developments that have now more or less been adopted by mountain biking. Just look at the sturdy unicrown front fork and stem.

The drive side with Sachs-Huret and Stronglight is also of French origin. Note the chainrings: BioStrong, somewhat similar in shape to Shimano's BioPace, but also different. Apparently more manufacturers were studying the dead center problem.

The rear has also been stepped up: this mountain bike has no less than 7 sprockets, resulting in 21 gears! O-la-la…