Revue Thommen Diver Professional Automatic Chronograph pairs a Valjoux 7750 automatic movement with professional-grade 30 bar water resistance for dependable performance during diving and timing tasks. Key attributes: Black | Stainless steel | Water resistant to 30 bar (300 m) | Sapphire crystal | Automatic Valjoux 7750 movement | Chronograph stopwatch | Day-date calendar | Unidirectional rotating bezel | Tang buckle clasp | Round case | Black dial | Rubber strap | Dimensions & fit: Case diameter: 45 millimeter | Case height: 16 millimeter | Band width: 24 millimeter | Standard strap length | Composition & care: Stainless steel | Rubber | Sapphire crystal | Wipe with a soft cloth. Rinse with fresh water after salt exposure. Avoid chemicals and extreme temperatures. Have serviced periodically by a professional watchmaker.