74 duster

Is that a factory rear defrost blower ? On a fold down seat car ?
I had a 73 Dart Sport in the early 80's, but it came with an electric defrost.

BTW ... I'm parting out a 74 Dart with folding seat and it has the rear trim.
Someone put 6" round speakers in the fender well trim. But it looks like they did a nice job.