Citizen Mechanical Automatic Watch Mechanical Open Heart See-Through Back Waterproof Black NH9131-14E Men's Black

[Citizen Collection that pursues the basic performance and design of watches] A mechanical watch with a classically modern design. It has an open heart design that allows you to enjoy the delicate movement of the balance wheel, which is the heart of a mechanical watch, through the window at the 6 o'clock position on the dial. [Gorgeous pink gold hands and indexes placed on a black dial] A distinctive design with a dial pattern that radiates out from a circular window. The case back is a see-through back. You can enjoy the rotating weight part and the movement of the mechanism. [Mechanical self-winding watch] A mechanical self-winding watch powered by a mainspring. When you wear a watch on your wrist, the movement of your arm moves the rotating weight inside the watch, automatically winding the mainspring. *You can also check the operating instructions from the instruction manual on the manufacturer's website (model number: 8229). [Product Details] Mechanical wristwatch, automatic + manual winding, -20 to +40 seconds/day, approximately 42 hours (maximum winding), crystal glass, case: stainless steel, band: calf, water resistant to 5 ATM