The Tudor Black Bay 58 Ref. 7939A1A0NU is a masterful blend of heritage dive-watch design and contemporary craftsmanship, housed in a perfectly proportioned 39mm stainless steel case that pays homage to the original Tudor divers of the 1950s while offering modern wearability . This celebrated model features a classic, domed matt black dial with applied hour markers and the iconic angular “Snowflake” hands, a hallmark of Tudor design since 1969, all filled with Super-LumiNova® for exceptional legibility in any light . The unidirectional rotating bezel, crafted in stainless steel with a matte black anodised aluminium insert, completes the tool-watch aesthetic . At its heart lies the in-house Manufacture Calibre MT5400-U, a COSC and METAS-certified chronometer movement that delivers an impressive 65-hour power reserve, superior anti-magnetic performance, and robust precision . A standout feature of this reference is its refined five‑link “Jubilee” style stainless steel bracelet, which lends the watch a more elegant, dressier character while maintaining durability, and is secured with Tudor’s signature T‑fit folding clasp offering a quick, tool-free micro‑adjustment of up to 8mm for the perfect fit . Engineered as a professional-grade instrument with 200 meters of water resistance, a screw‑down crown, and a domed sapphire crystal, this 39mm timepiece is the ideal companion for the discerning collector who values both heritage and modern innovation in a versatile, everyday luxury watch . Key specifications: 39mm steel case; black dial with luminous Snowflake hands; Manufacture Calibre MT5400-U automatic movement (COSC/METAS); 65-hour power reserve; stainless steel Jubilee bracelet with T-fit clasp; 200m water resistance; sapphire crystal .