Since my flame is a separate piece, I wonder if that was original with my sign? My flames graphic (to me) looks newer than the signs graphics. I certainly am no authority on that.
I think you are right on that. Could be a transition sign, where they mixed the two different logos, but more likely the flame got damaged and someone replaced it with the more modern design. Those flames come up for sale every once in a while, you could always keep an eye out for one.