Thank you four your answers,
The Game Stunt Cycle is a chip that Atari Release for their machines, but i think it was cloned for other consoles.
Hoo it makes me crazy
and now i think is an Atari
The Magazine doesnt show further information about this machine.
It is just Shown in the front Page, and inside the magazine it talks about the Odyssey II, The Bally Astrocade, Atari 2600 and Intellevision.