Impact forged stainless steel case• Screw-down stainless steel case back• High-precision Computer Numeric Control (CNC) machining• Sapphire crystal with anti-reflective coating• Dual-sealed crown for high-pressure endurance• 10 bar water resistance (100 meters / 330 feet)•Swiss Made 10 jewel, gold finish movement, TYPE OF OSCILLATOR: Quartz tuning fork FREQUENCY OF OSCILLATOR: 32,768 cycles per sec. DRIVESYSTEM: Two-pole step motor (180o/sec .) ACCURACY: -10/+20sec per month BATTERY: Silveroxide no. 341(sr714SWY)