Are you sure it was a Sega cab? Looks like an Atari cab. Blasteroids maybe? Or Marble Madness/Indy Jones/Road Blasters etc.
Well, the seller said it was a "Sega WWF Superstars" Cabinet, but WWF Superstars was made by Technos. I figured that their was some sort of a plate or something on the cab that said Sega. The sale is over now so I guess I can reveal the auction (as if someone was gonna buy it out from under me...)
HereThere looks to be a plate on the back and I thought it looked Atari-ish, but it could really be anything. Bally and Nintendo made ID plates like that so I have no idea. It must not be anything worth messing with if its not a recognizable game.
EDIT: Damn my url coding skillz...