1. CONSTELLATION CONSTELLATION OMEGA CO AXIAL 38 MM Steel on steel MOVEMENT Caliber Omega 8500 Self winding movement with Co Axial Escapement for greater precision stability and durability Free sorung balance 2 barrels mounted in series automatic winding in both directions to reduce winding time Bridges and the oscillating mass are decorated with exclusive Geneva waves in arabesque Power reserve 60 hours CRYSTAL Domed scratch resistant sapphire crystal with anti reflective treatment on both sides ref 123 10 38 21 01 001 CASE amp DIAL Case Steel Case Diameter 38 mm Dial Black WATER RESISTANCE 10 bar 100 metres 330 feet FEATURES Date Chronometer Transparent case back www omegawatches com