featureUnidirectional rotating bezel Chronograph Small seconds date Helium escape valve Master Chronometer Certified Screw-down crown Small Seconds Time zone function Transparent case back Unidirectional rotating bezel ?? caseTotal product weight (approx.):????237 gBetween lugs:????21 mmThickness:????17.2 mmCase:????Sedna?? GoldCase diameter:????44 mmWater resistance:????30 bar (300 m/1000 ft)??Dial and CrystalDial color:????blackMirror:????Arched wear-resistant sapphire crystal, double-sided anti-reflective treatment??braceletMaterial:????Steel a?? Sedna?? GoldClasp Type:????Folding clasp with comfort setting and diver extension