It has a standard 4/8-way type base and then a potentiometer that allows the joystick to turn maybe 330 degrees.
The "Battlezone" handle is different than any of the handles we have on our three BZs or Red Baron in that there are nuts for the bottom two screws and the top screw can actually be seen from both sides of the joystick.
It also looks NOS as there is no bolt hole damage or contact scuffs like there would be from spade connectors.

