When Hans Wilsdorf created Tudor, he wanted it to achieve the same dependability standard that made its bigger brother, Rolex, famous. That's where the unisex Black Bay Chrono watch comes in. Assembled from durable steel, this robust timepiece takes inspiration from the watchmaker's 50s divers' watches. Powered by the MT5813 calibre, it's complete with a 70-hour power reserve and is ready to withstand up to 200-metre underwater depths. Impressive.Tudor stainless-steel and leather automatic watch100% stainless steel; strap 100% leatherStyle number: M79360N-0005Folding-clasp fastening with safety catch and removable bundDomed dial with date at 6 o'clock, polished satin case, Calibre MT5813 (COSC), self-winding mechanical movement with bidirectional rotor system, 70hr power reserve, 316L steel screw-down pushers at 2 o'clock and 4 o'clock, fixed 316L steel bezel with matte anodised aluminium disc with tachymetric scale and silver markings, domed sapphire-crystal glassCase diameter: 41mmWipe with a clean, dry clothWater resistance: 20 bar / 20 atm / 200m / 660ftMade in SwitzerlandFive-year manufacturer's warranty