Made for those who favor function and style at once, the Jazzmaster Performer line offers a powerful sport-chic appearance. Powered by the H-31 automatic chronograph movement with 60 hours power reserve, this Jazzmaster Performer Automatic Chronograph features a 42mm stainless steel case accented by a sleek blue dial and a matching racing-style perforated blue leather strap. Reference : H36616640 Caliber : H-31 Collection : Jazzmaster Movement : Automatic Case size : 42mm Thickness (mm) : 15.22 Dial color : Blue Case material : Stainless steel Crystal : Sapphire Lug width : 22mm Power reserve : 60 hour Water Resistance : 10 bar (100m)/145 psi (328ft) Anti Reflection : Yes Open Case Back : Yes Screw Down Crown : Yes Nivachron : Yes BRACELET/STRAP Strap reference : H6000001491 Strap type : Calf leather Buckle type : Folding clasp Buckle width : 20mm Movement: The H-31 is a powerful automatic chronograph movement featuring an extended 60-hour power reserve, making it perfect for the demands of the sportiest of models. With an H pattern design on the oscillating bridge, there?s no mistaking who made this movement.