[Arran]

Mike;
In my experience it seems to be the farm radios that end up with burned up antenna coils, at least on the primaries, though I have an AC set in the back room where the antenna coil was removed, and replaced with a ferrite bar antenna. I don't know what happened to the original but possibly a lightning strike took out the primary.
With regard to the O.P I think the upper diagram is the correct one, it shows a center tapped secondary, I guess for the old police band, which may account for what looks like a third coil, the second diagram shows a transformer assembly that if all in one would have seven lugs on it.
Regards
Arran