Pulled it out after dinner:
Upon further review...not an original Tetris, it was a Tetris conversion kit. I'm not sure what game it originally was, i'm slowly pulling off the Tetris side panel stickers, looks like some sort of camel?
The original PCB's whatever that game is - is still in there and mounted in it's original location. Tetris, as you can see is getting power and was mounted to the rear door. As you can see, this is a JAMMA cabinet conversion! So...I REALLY want to get this thing running.
Messed around very rudimentarily - got the screen to show a flicker, but then it dies out. The bulb in the neckboard is flickering and giving off very little light - I "think" that is the problem...or at least one of the problems. I'll be researching compatible neckboards.
Pulled out the tetris PCB and gonna run it on my supergun to verify all's good with it. Between the PCB, marquee (good shape) and CP (ok shape), I should be able to pull $100 out of those parts alone if I can't get it running.