The Omega 891.0178 watch movement is a mechanical, automatic movement. It features hours, minutes, and seconds functions, along with a date display. The movement operates at a frequency of 28,800 beats per hour and has a power reserve of approximately 48 hours. It utilizes a bi-directional self-winding system and incorporates 31 jewels for enhanced durability and smooth functioning. The movement measures 27.4 mm in diameter and has a height of 4.8 mm.