The Citizen 4-S40308 watch movement is a manually wound mechanical movement with a frequency of 18,000 vibrations per hour. It has 17 jewels and a power reserve of approximately 46 hours. The movement features hours, minutes, and small seconds functions. It has a diameter of 11.5 ligne and a height of 4.5mm. The movement is regulated by a swan-neck fine adjustment mechanism and has a shock protection system.