This looks same than the other Sixplay Pongs but has silver paddle slider knobs
Thanks to Thomas Doerpinghaus of www.pong-museum.de for this picture
More infos: Old-Computers

Scans of Manual:

The stamp shows the date of sale (Sept.1977), the point of sale (Mammouth a big department store chain that existed from 1970-80) and the location where it was purchased: Chateauroux, a small town in the heart of France. Price was 440 Francs - that´s around 69 Euro