Tudor Black Bay 58

The Tudor Black Bay 58, reference M7939A1A0NU-0003, is a dive watch with a 39mm steel case. The case measures 11.7mm thick, with a 20mm lug width for strap fitting. A unidirectional rotating bezel in steel with an anodised aluminium insert surrounds the matt black dial, which sits under a domed sapphire crystal. The screw-down crown secures the case, and hour markers and hands carry luminous treatment for visibility. Inside is the Manufacture Calibre MT5400-U, a self-winding movement certified as a Master Chronometer with 65 hours of power reserve. A central seconds hand completes the dial layout. The watch comes on a rubber strap with a steel folding clasp, and Tudor rates the case to 200 metres.