From the inside the two circular windows behind the denomination and maker badges could have sported casings which might have had a light.
However it's difficult to see where a transformer etc would have sat.
I think it is an outstanding machine and would have it firmly on show!
What is the mark next to the Mills decal? It looks like a face.
I don't know if it's a trick of the light in the photograph but both wooden sides look to have a horizontal line across them about a quarter of the way up. Has it stood in water at some time?
It's certainly a beauty and I envy you.