About This Watch: This Omega Constellation Co-Axial Watch 123.20.31.20.05.002 has an automatic movement with a co-axial escapement feature. It features a white mother-of-pearl dial and a scratch resistant sapphire crystal. Its finely crafted case is made out of 18K yellow gold and stainless steel. This watch is water resistant up to 10 atm; 100 meters; 330 feet.