The Black Bay Chrono boasts a 41mm steel case with a polished and satin finish. It houses a self-winding mechanical movement, Manufacture Calibre MT5813, with a bidirectional rotor system and a substantial 70-hour power reserve. It's waterproof to 200m, with steel screw-down pushers at 2 o'clock and 4 o'clock. The fixed steel bezel features a black anodized aluminum disc with a tachymetric scale. The watch's black dial, with silver counters and a date display at 6 o'clock, is protected by a domed sapphire crystal. It comes with a riveted steel bracelet that combines polished and satin finishes, with a folding clasp and safety catch. M79360N-0001