The Omega 7899R watch movement is a mechanical movement that features automatic winding, a central hour and minute hand display, a sub-dial for small seconds, and a date function at the 3 o'clock position. The movement operates at a frequency of 28,800 beats per hour (4Hz) and has a power reserve of approximately 38 hours. Its compact design, with a diameter of 10.5 lignes (23.3 mm) and a thickness of 4.8 mm, allows for integration into various watch case sizes. The movement comprises 25 jewels and utilizes a bi-directional winding system.