Tudor Black Bay One M79663-0006 39 mm Diamond Dial

The Tudor Black Bay One M79663-0006 returns the 39 mm steel case to a deep black satin dial, with applied markers adding structure. A fixed steel bezel and silver stainless steel bracelet surround the dial, while the flat sapphire crystal, screw-down crown and Super-LumiNova support its clear, functional presentation. The 12 mm case is rated to 100 metres, giving this reference a balance of presence and practical specification.

Inside is the automatic Tudor MT5602, a Tudor/Kenissi manufacture-platform calibre with 25 jewels and an openworked tungsten monobloc rotor. It measures 31.8 mm across and 6.5 mm high, using a free-sprung variable-inertia balance and flat silicon hairspring at 28,800 vibrations per hour. Its 70-hour power reserve and COSC Chronometer certification round out the movement details. As a Black Bay One, this reference uses the 39 mm steel architecture to give the black dial a direct, instrument-like emphasis.