DB = Deutsch Bonnet. They had Panhard engines and monopolised the Index at Le Mans for years. Colin Chapman gave them a fright though with the Eleven.
I too had the Merit "Driving Test" game (not racing though|) and remember being fascinated by the mechanism. Its in the attic now and is a little warped by the damp, being mostly cardboard. I have never seen one since my youth and never heard of anyone else owning one until now.