1. CONSTELLATION CONSTELLATION CO AXIAL 35 MM Steel on steel MOVEMENT Caliber Omega 2500 Self winding chronometer Co Axial Escapement movement with rhodium plated finish Power reserve 48 hours CRYSTAL Domed scratch resistant sapphire crystal with anti reflective treatment inside ref 123 10 35 20 01 001 CASE amp DIAL Case Steel Case Diameter 35 mm Dial Black WATER RESISTANCE 10 bar 100 metres 330 feet FEATURES Chronometer Date Transparent case back www omegawatches com