Yeah, while I've been looking around at different controllers I found this which was posted on another Sega-16 controller thread a while ago. It's the third party controller that was rebranded for the Genesis 3. An earlier version of the Competition Pro by Honey Bee.
Though I must say from my experience Honey Bee's Series III pad has been swell so far so apparently they made some improvements. Too bad this is the pad that they put in with the Genesis 3 instead though I guess it's because it was inexpensive.