TUDOR Black Bay Crowned Black Dial 41 mm M79360N-0001 To celebrate 50 years of its chronographs, TUDOR is relaunching its Black Bay Corona in steel with a reworked case and two contrasting dial options in the purest sports chronograph tradition. Satin-finished and polished 316L stainless steel case, 41 mm in diameter, with fixed 316L stainless steel bezel, black anodized aluminum insert with tachymeter scale Snowflake-shaped hands, one of the hallmarks of TUDOR diving watches introduced in 1969, with Swiss grade A Super-LumiNova® luminescent material MOVEMENT: Manufacture Chronograph Caliber MT5813, certified by the Swiss Official Chronometer Testing Institute (COSC), with silicon balance spring, 70-hour power reserve, column wheel and vertical clutch. Precision: Swiss chronometer officially certified by COSC (Swiss Official Chronometer Testing Institute).