Detailed features & specificationsUNICO 2The Unico 2 caliber was designed to equip smaller chronographs and also open the world of Hublot to new enthusiasts. It retains the unique design of its former version with a double coupling system visible from the dial side as well as a 72-hour power reserve. But thanks to various technical optimizations, including the introduction of a new, flatter automatic winding system, it has been reduced by 1.3 mm in thickness.??SAPPHIREIn search of the perfect fusion between movement and case, Hublot engineers and chemists have researched and developed a transparent material which reveals the heart of the watch, all while being robust enough to effectively protect the mechanism. Thata??s how the Manufacture has become the expert of synthetic sapphire, a material from which it derives its aesthetic qualities that are unique within watchmaking a?? transforming each watch into a work of art.??Technical DetailsReference a?? 441.JY.4909.RTSize a?? 42 mmCase a?? Polished Yellow Sapphire CrystalBezel a?? Polished Yellow Sapphire Crystal 6 H-shaped Black-plated Titanium ScrewsWater Resistance a?? 50m Or 5 AtmCrystal a?? Sapphire With Anti-reflective TreatmentDial a?? Polished And Smoked Transparent Composite Resin Skeleton DialMovement a?? Hub1280 Unico Manufacture Self-winding Chronograph Flyback Movement With Column WheelPower Reserve a?? 72 HoursStrap a?? Transparent Yellow Structured Lined StrapsClasp a?? Black-plated Titanium Deployant Buckle Clasp