Epic X Chrono 44MM Titanium (Black) Color:Titanium (Black) self windingCalibre: 3255 self windingCalibre: 3255 The Rolex Lady Datejust 28 (Reference 279161) is a refined expression of elegance and precision Brand Jacob & Co Minutes and Seconds Chronograph: Central Chronograph Seconds' Hand 30 Minute Counter at 3 o'clock Power Reserve: 48 Hours Frequency: 28'800 vib h (4 Hz) Jewels: 27 Jewels System: Semi Skeleton Column Wheel Chronograph Case Diameter: 44mm Height: 14mm Material: Titanium and Black Ceramic Bezel: Black Ceramic Inner Ring: Black DLC Titanium Crown and Pushers: Black Ceramic Caseback: Transparent Smoked Sapphire Crystal Crystal: Sapphire with Anti Reflective Treatment Water resistance: 100m (10atm) Dial Dial: Gray Crystal with Titanium Details Hands: Rhodium Plated Skeleton and Red Chronograph Hands Strap Bracelet Strap: Honeycomb Rubber Clasp: Titanium Deployment Buckle Limited Edition Individually Numbered Pieces Gender Unisex Origin Switzerland