The Tudor Black Bay Fifty-Eight Navy Blue reference M79030B-0001 represents one of the most beloved entries in Tudor's modern dive watch catalog. Introduced at Baselworld 2020 as a follow-up to the 2018 Black Bay Fifty-Eight in black, the Navy Blue variant draws its inspiration from Tudor's 1969 Submariner reference 7016/0 with its blue dial and matching bezel. The 39mm steel case measures a wearable 11.9mm thick across 47mm lug-to-lug, capturing the proportions of the brand's mid-twentieth-century dive watches while incorporating contemporary manufacturing finishes. The domed blue dial carries applied luminous markers and the signature snowflake hour hand that has defined the Black Bay line, framed by a unidirectional rotatable bezel with a matte blue anodized aluminum insert and silver gilded sixty-minute scale. Powered by the Tudor Manufacture Caliber MT5402, a COSC-certified self-winding movement with a 70-hour power reserve, silicon balance spring, and 28,800 vibrations per hour across 27 jewels. Water resistant to 200 meters with a screw-down crown, fitted on a riveted steel bracelet with folding clasp and safety catch. 2025 production, pre-owned with full Tudor box and papers.