Gas Cap

Did the car ever have a cap on it? It was apparently correct at one time. I have never heard of a car leaving the factory with a cap that sits crooked and it would be harder to believe that the filler neck was clocked incorrectly. Has something on the car been changed during body work or a rebuild. I think there is more to this story. If I get a chance, I will take a picture of my 70 Swinger. It's all original and should be correct.
It had a mid 70s cap on it. With the extra prongs. Original cap is long gone. But that cap would sit parallel at least. Whether somethimg got changed, im not 100% sure. Car was restored in the early 90s with some part s from other darts.