Help identifying this mirror

Here is a pic of my uncles 71 duster 340. Bought it in 73 from the original owner. Had it a year and cracked it up racing. It was all fixed properly as this pic was taken in 75. I am restoring the car and I am lost on the mirror. He said that it is the mirror that came on from the factory, but I can't identify it. Anyone care to chime in on it?. It is a manual mirror as the door has no hole for the remote cable.