From Tudor, the Black Bay 54 “Lagoon Blue” evokes somewhere warm, where the sun shines onto waves of azure water and white sand beaches. A watch can do more than tell time, it can shift your mindset. Its magical combination of perfect proportions with its 37 mm case, “Lagoon Blue” sand-textured dial, and mirror-polished bezel, as well as its comfortable five-link bracelet transports its wearer to a hammock laced up between two palm trees right where the water meets the sand.The Black Bay line was conceived with the past in mind. The Black Bay 54 is perhaps the most true to form Black Bay to have been created thus far. The Oyster Prince Submariner reference 7922 is a formidable candidate to draw inspiration from, as it was known to have been evaluated and consequently adopted by the French and US Navies and widely used by diving professionals. The Black Bay 54 follows this tradition with thoroughly modern touches, like a subtle sand-textured dial and a “T-fit” clasp for the perfect fit. And of course, the cutting-edge Manufacture Calibre MT5400.Case: 37mm stainless steel case with polished and satin finish; Lugs: 20mm lug width; Case thickness: 11.2mmBezel: 60-minute unidirectional bezel in stainless steel with mirror-polished steel insert devoid of minute graduationsMovement: Manufacture Calibre MT5400 (COSC): Self-winding mechanical movement with bidirectional rotor systemPower Reserve: 70 hoursWinding Crown: Stainless steel screw-down crown with the TUDOR rose in reliefWaterproofness: Waterproof to 200m (660 ft)Dial: Blue, domed and texturedCrystal: Domed sapphire crystalBracelet: Five-link stainless steel bracelet with polished and satin finish, with TUDOR “T-fit” claspTUDOR's Guarantee: Five-year transferable guarantee with no registration or periodic maintenance checks requiredTUDOR Style #: M79000-0001