Zenith ACADEMY Premium Series Spherical Tourbillon, model: 18.2210.8804, 45MM in diameter, with an 18K rose gold case and clasp, features Zenith's patented zero-gravity tourbillon system, also known as the Columbus manual tourbillon. Through a dual-axis gyroscope frame, it keeps the escapement and regulating mechanism always in a horizontal state. No matter how the wrist rotates, it can counteract the influence of gravity on the movement's timekeeping. Power reserve display function. Limited to 25 pieces worldwide, all unused inventory collectibles come with complete accessories (warranty card blank).