68 Crown Coupe – Mystery Switch

Gentlemen, I'm sure someone with way more knowledge than I will identify this in no time. I looked in the owner's manual and FSM and can't find it. This leads me to believe that it's for a top secret ejector seat, rocket launcher, or Red Rope licorice dispenser (a la Wayne's World). It's a little black slider on the rear passenger side arm rest. No clue what this could be for. Extra points for most creative answer but the real answer would be most appreciated as well! Thanks guys!...

68 Crown Coupe - Mystery Switch