The controller for the Bally Professional Arcade (also known as the Astrocade and Home Library Computer) video game console.  Originally released in 1978, it is an odd and early controller, with a pistol grip, trigger and a joystick knob.
<a href="//commons.wikimedia.org/wiki/User:Evan-Amos" title="User:Evan-Amos">Evan-Amos</a>
<span class="int-own-work" lang="en">Own work</span>