The Citizen 4-281390 is a mechanical manually wound movement with a Caliber of 16-250. It has a diameter of 16.3 mm and a height of 2.5 mm. The movement has 18 jewels and 4 bridges, with a total of 101 parts. The balance is annulaire, with a frequency of 28,800 vibrations per hour (4 Hz). The power reserve of the movement is a minimum of 38 hours. It is also worth noting that the movement carries the Hallmark of Patek Philippe Seal.