"Launch Ball" Button used on Medieval Madness, Attack From Mars, Bram Stoker's Dracula, Champion Pub, Demo Man, Johnny Mnemonic, Popeye and Monster Bash.
Comes complete with push button, lamp assembly (including bulb and switch), and tightening nut.
Williams/Bally #20-9663-B-4.
Chicago Gaming Company #PIN-20-9663B4.