Omega Constellation Co-Axial Master CHRONOMETER Small Seconds Petite Seconde Watch - 27 mm Steel Case - White Mother-Of-Pearl Diamond Dial - 127.15.27.20.55.00127 mm stainless steel case, transparent back, domed scratch resistant sapphire crystal anti reflective treatment on both sides, white pearled mother of pearl dial with 10 diamond indexes and a date window at 6 o'clock, Caliber Omega 8704 self winding movement with co axial escapement, chronometer, date, approximately 50 hours of power reserve, stainless steel bracelet. Water resistant to 10 bar (100 metres 330 feet).