This bright, pure black dial is the perfect backdrop against which the diamond-cut hands and hour markers stand out in sharp relief and mark the time with Spring Drive’s remarkable one-second-per-day precision. Thanks to Grand Seiko’s unique Spring Drive movement, the seconds hand glides silently and smoothly, with no “tick”, across the dial, perfectly refl Exterior: Stainless steel Case back: Screw case back Glass Material: Dual-curved sapphire crystal Glass Coating: Anti-reflective coating on inner surface Case size: Diameter 40.0mm Lug-to-lug 46.6mm Thickness 12.3mm Band width: 20mm Clasp type: Three-fold clasp with push button release The perimeter of Band: 203mm Movement Caliber no.: 9R65 Instructions Movement Type: Spring Drive Power reserve: Approx. 72 hours(3 days) Accuracy: ±15 seconds per month (±1 second per day) Functions Water resistance: 10 bar Magnetic resistance: 4,800 A/m Other details / Features: Screw-down crown 30 jewels Power reserve indicator