The 4-player version of this game is Chicago Coin's 1976 'Cinema', with different backglass artwork and cabinet colors.
The chime unit is manufactured by NuTone, is factory-installed, and is referenced in the parts manual. It has two solenoids and two chime bars. When 100 points is scored, the left solenoid plunger strikes the lower chime bar only. When 1000 points is scored, the right solenoid plunger strikes the lower chime bar and, on its rebound, strikes the upper chime bar. Thus, it sounds "ding" for 100 points and "ding dong" for 1000 points.
