Not sure what kind of leaf it resembles, though. In any case, I don't think there is anything else like it in the world of horology right now. (Maybe, to a slight degree, the case shape of the original 1950s Hamilton Ventura, but that's less streamlined a...
When the leaf petals dry in Fall they look like this: Flageollet was inspired by the shape during one of his forest walks. It's actually quite a beautiful reference. ...
I know the tulip tree well (retired landscape architect, used to spec them often in designs). I somehow failed to ever notice the way the leaves curl once they fall. Great inspiration!