There couldn’t have been too many Dusters with the 360 roll off the line in 1976??? It was an option instead of a separate model (Duster 360) in 1976. Plus this one has a sunroof too!
Back in 78 there was a guy in Las Cruces that had about thirty Mopars his last name was Geiger. I wonder if this is his cars in the background in picture 5 and 6.