Mr. Bally beat me to the history.
This is a Bally 1976 Prototype SS conversion of the EM game Kick Off.
It is not tied to Atari, and the PCB boards were used from various sources at the dawn of the SS era, not exclusive to use pinball or video games or the future Atari patents. Nutting did board work in conjunction with multiple manufacturers of the period.
This is not an operator conversion either.
Unknown number created, but I doubt more than a couple at the factory, as they scrapped the conversion decision.
Essentially, it was competing against other games of the same period 1976-1978 periods of which games might be used for SS technology as test beds of creation.
I don't even know if David Judd Nutting wants to answer questions about his company or dealings with Bally.
The man is in his late 80s, and I doubt "he has a PinSide account".
Bally shut down Dave Nutting Associates in 1984 permanently out of the cross technology lawsuit, which if interested can be found as this was documented.
The game is valuable in its own for history, more so than even a collector.
However, if 100% functional (including its UNIQUE displays), worth about 4X above basic EM value which would make it sit around $1800-2000 to the right early Bally person.
This essentially for a collector who wants to own something exclusively for the history.
For everybody else, $600.