'66 Dart Wagon Survivor "refurbish"

Here in Europe that mud flap was very common on the wagons. The reason was simply to keep out of the dirt on the back window. I remember my neighbour who had a frost green 1961 Valiant wagon. He had that big mud flap and it was mostly layin on the ground with a lot of noice when he was driving. He was a carpenter so he's car was very loaded most of the time.

That is a neat picture of your fathers car!