I got this board from a guy who told me it was out of a galaga cab. I did some looking around and it is similar, but I don't think it is one. There are 2 boards connected by a ribbon cable one being bigger than the other. There are no identifying words on the boards. Also no midway or namco marks. Some of the bigger chips in the center are marked NEC. Here is a photo:
There are a bunch of chips in the center that are labeled with a red circle and g1-g7 on them. There are also 3 more on the back board.
Any help is appreciated!!