The Citizen 4-S12885 watch movement is a mechanical movement that features manual winding, hour, minute, and small seconds functions. It has a frequency of 4 Hz and a power reserve of approximately 50 hours. The movement consists of 149 parts and is composed of 17 jewels. It has a diameter of 30.4 mm and a thickness of 4.8 mm. The movement has a balance wheel with a variable inertia and an Incabloc shock protection system. It also incorporates a Glucydur balance spring and a Nivarox 1 hairspring. The Citizen 4-S12885 movement operates with high precision and reliability.