Thanks Jules - are you saying that the light bar I am showing there is from a 72-74 car?

That is odd. I am as certain as I can be that this is original to the car. I've owned it since the mid-80's and when I first took it off around then it did not in anyway appear to have been replaced. Never say never of course, but could it be possible that Ma Mopar switched early, my car is a Feb 71 build.