• @evidences
    link
    33 hours ago

    It’s essentially a fancy watch spring mechanism. So the open spot on the bottom of the dial is the tourbillion as it unwinds it rotates around.

      • @evidences
        link
        23 hours ago

        Generally yes, like the other reply said it might be automatic and self winding. It’s a style of mechanical watch though so something somehow has to tension the spring that makes the watch run.