Found my dads original 1971 duster!

Here:

Have you ever seen any Dart, Valiant, Demon or Duster with a rear window defroster?

You can learn everything about the quite rare rear window defroster option on Dusters.
Wow. I’ve looked quickly at it. Very cool information there. So maybe mine was supposed to have it, but they never got installed. The builder says the wiring harness didn’t even have spots for them