About This Watch: This Omega Constellation Co-Axial Watch 123.20.31.20.13.001 has an automatic movement with a co-axial escapement feature. It features a brown dial and a scratch resistant sapphire crystal. Its finely crafted case is made out of 18K rose gold and stainless steel. This watch is water resistant up to 10 atm; 100 meters; 330 feet.