Arguably, Voltan is one of the most colorful classic Bally games ever made. Hard to beat Dave Christensen artwork. Gameplay is rather boring, all you can shoot at are five stand up targets and keep sending the ball up to the top through the spinners, thats it. It did not do well on location, that is why it is a low production game. Bally Mystic, made the following year, is Voltan with drop targets and a captive ball shot.

If you are looking for a Voltan, the OPs game looks like the one to buy.