El Primero 9004

This self-winding movement includes a cam-operated chronograph that tracks intervals down to 1/100th of a second. The chronograph features a dedicated escapement oscillating at 360,000 vph with a 50-minute manual power reserve, while the timekeeping balance operates at 36,000 vph via automatic or manual winding. Both balance springs utilize a carbon-matrix nanotube composite, and a power reserve indicator for the chronograph is located at 12 o'clock. Features: Chronograph, Chronometer, Power Reserve Indicator.