It was an experiment in making a graduated flat top. So it is a thick flat top which is then carved to have roughly the same thickness "map", but it is only carved on the top side of the plates. Also, it has tone bars. Weird, but that's all I knew at the time and it worked out just fine.
It has that nasal tone you expect from a flat top instrument, but it's really responsive and balanced. Too much sustain for a lot of styles. But awesome for British Isles stuff.