251.264 AA

ETA PreciDrive movement featuring a 12-hour counter at 10 o'clock, a 30-minute counter at 2 o'clock, and central hands for both 60-second and 1/100th-second chronograph functions. Utilizing thermo-compensation to regulate motor pulses based on ambient temperature, this movement achieves precision capable of meeting COSC standards when maintained between 20°C and 30°C; the integrated circuit and quartz are housed in a waterproof case to prevent moisture-related accuracy issues.