• evidences@lemmy.world
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      2 months 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.

          • kent_eh
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            2 months ago

            the movement of the arm winds it

            That explains why Trump fails his arms around during his rambling speeches.

        • evidences@lemmy.world
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          2 months 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.