Citizen COLLECTION Watch [CITIZEN] NH9131-73L Men's

[Citizen Collection: Pursuing the fundamental performance and design of a watch] A mechanical watch with a classically modern design. The open-heart design allows you to enjoy the delicate movement of the balance wheel, the heart of the mechanical watch, through a window at the 6 o'clock position on the dial. [Navy dial with striking silver indices] This watch features a distinctive dial design with a pattern radiating outwards from a circular window. The case back is see-through, allowing you to enjoy the rotating weight and the movement of the mechanism. [Mechanical Automatic Watch] This is a mechanical automatic watch powered by a mainspring. When you wear the watch on your wrist, the movement of your arm causes the rotating weight inside the watch to move, automatically winding the mainspring. *Operation instructions can also be found in the instruction manual on the manufacturer's website (model number: 8229). 【Product Details】Mechanical wristwatch, automatic and manual winding, -20 to +40 seconds/day, approximately 42 hours (when fully wound), crystal glass, case and band: stainless steel, 5 ATM water resistance