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 black dial and an assertive stainless steel bracelet. Features WATCH Reference : H36606130Caliber : H-31Collection : JazzmasterMovement : AutomaticCase size : 42mmThickness (mm) : 15.22Dial color : BlackCase material : Stainless steelCrystal : SapphireLug width : 22mmPower reserve : 60 hourWater Resistance : 10 bar (100m)/145 psi (328ft)Anti Reflection : YesOpen Case Back : YesScrew Down Crown : YesNivachron : Yes BRACELET/STRAP Strap reference : H6050000101Strap type : Stainless steelBuckle type : ButterflyBuckle width : 20mm Movement H-31 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.