I'm leaning toward line-bred golds. The male greens (and golds) that I used to see in the hobby showed similar spotting as the super reds, meaning the horizontal rows of spots. The greens had the spots like the notatus we see now, and golds had the red spotting. In fact, there were people who'd tell you that said spots were more prominent in males; I heard that long before the "worm markings = male" that's usually said today. Yes there were plain gold/yellow sevs, but they showed no red on the body or face and tended to be females. I'm guessing somebody collected some excessively red ones and line bred them.
I do see them occasionally with different shaped faces, less blunt, more pointed. Those could be mixed with anything I suppose.