What can I see rotating in the movement when I look through the transparent crystal case back? 28 July 2023 13:05 Updated This is the oscillating weight, known as the rotor, of an automatic movement. As it spins, it winds your watch. Related articles Which Oris watches are anti-magnetic? Which materials feature in Oris movements? Are Oris watches affected by magnetic fields? How do I put my watch into operation? What should I do to get my my Calibre 400 Series watch going again if it has stopped?