Exterior: High-intensity titanium Case back: See-through & Screw case back Glass Material: Dual-curved sapphire crystal Glass Coating: Anti-reflective coating on inner surface LumiBrite: LumiBrite on hands, indexes and bezel Case size: Diameter 45.3mm Lug-to-lug 52.6mm Thickness 15.8mm Band width: 23mm Clasp type: Three-fold clasp with push button release The perimeter of Band: 197mm Movement Caliber no.: 9R96 Instructions Movement Type: Spring Drive Power reserve: Approx. 72 hours(3 days) Accuracy: ±10 seconds per month (±0.5 second per day) Functions Water resistance: 10 bar Magnetic resistance: 4,800 A/m Weight: 140 g Other details / Features: LIMITED EDITION on the case back Serial number engraved on the case back Rotating bezel Screw-down crown Allergy-safe metal 50 jewels 24-hour hand (dual time display function) Chronograph with 30 minutes & 12 hours Power res