1. CONSTELLATION CONSTELLATION OMEGA CO AXIAL 31 MM Steel on steel MOVEMENT Caliber Omega 8520 Self winding movement with Co Axial Escapement for greater precision stability and durability Free sorung balance system with silicon balance spring Automatic winding in both directions to reduce winding time Rhodium plated finish with exclusive Geneva waves in arabesque Power reserve 50 hours CRYSTAL Domed scratch resistant sapphire crystal with anti reflective treatment on both sides ref 123 10 31 20 05 001 CASE amp DIAL Case Steel Case Diameter 31 mm Dial White mother of pearl WATER RESISTANCE 10 bar 100 metres 330 feet FEATURES Chronometer Date Transparent case back www omegawatches com