The Omega 166.0038 watch movement features an Adjustable Stud Holder for enhancing timekeeping accuracy. It operates automatically, powered by self-winding mechanisms. The movement incorporates a Day and Date Display feature, allowing simultaneous indication of the day of the week and the date. It includes a Sweep Seconds function, providing a smooth and continuous motion of the seconds hand. Additionally, the movement comprises a Calendar, enabling the tracking of months, days, and years. It incorporates 35 Jewels, which serve as bearings to minimize friction and maintain optimal performance.