I wonder if the splines are from the wheel being forced on a shaft with splines. Is the hole tapered and the splines only in the small end? As posted on the HAMB, it sure looks like wheel I did not get off a 37 Lincoln.
Splined type hubs generally don't have a big keyway as that one does. I don't know of an Ford product that would have used that wheel. It could have come from a boat for all I know.