{"product_id":"case-687-tudor-black-bay-58-blue-ref-79030b-0001","title":"Case #687 — Tudor Black Bay Fifty-Eight “Navy Blue” Ref. M79030B-0001","description":"\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003eCase #687 — Tudor Black Bay Fifty-Eight “Navy Blue”\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eRef. M79030B-0001\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eStatus: Available\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eCondition: Excellent Pre-Owned\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eScope: Box, Papers, and Cards\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eCase Notes\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe blue Black Bay Fifty-Eight takes the formula that made the 39 mm BB58 such a success and cools it down completely.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eInstead of the gilt-heavy black-and-gold palette of the original, the M79030B uses a rich navy-blue dial, matching matte blue aluminum bezel, silver-tone hands and markers, and Tudor’s riveted stainless-steel bracelet.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe result feels cleaner, more modern, and a little less overtly vintage while preserving everything that made the Fifty-Eight work in the first place: compact proportions, no-date symmetry, a long power reserve, and serious dive-watch capability.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eAt 39 mm, the case hits a particularly useful middle ground. It has enough presence for a modern sports watch but remains compact enough to wear comfortably across a wide range of wrists.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eInside is Tudor’s Manufacture Calibre MT5402, a COSC-certified automatic movement with approximately 70 hours of power reserve.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThis example dates from 2023 and presents in Excellent Pre-Owned condition. It includes its Box, Papers, and Cards and is currently sized for approximately a 7¾-inch wrist.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eBecause it dates from 2023, it should also retain meaningful Tudor factory warranty coverage, subject to the exact warranty-card date and Tudor’s five-year transferable guarantee terms.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe Evidence\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eReference: M79030B-0001\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eModel: Black Bay Fifty-Eight\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eYear: 2023\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eCase: Stainless Steel\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eCase Diameter: 39 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eDial: Domed Navy Blue\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eCrystal: Domed Sapphire\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBezel: Unidirectional Stainless Steel with Matte Blue Anodized Aluminum Insert\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eCrown: Screw-Down\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eMovement: Tudor Manufacture Calibre MT5402\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eMovement Type: Automatic\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eCertification: COSC Chronometer\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eFrequency: 28,800 VPH\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eJewels: 27\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003ePower Reserve: Approximately 70 Hours\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eFunctions: Hours, Minutes, Central Seconds\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eWater Resistance: 200 meters \/ 660 feet\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBracelet: Riveted Stainless-Steel Bracelet\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBracelet Fit: Approximately 7¾-inch Wrist\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eCondition: Excellent Pre-Owned\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eFactory Warranty: Remaining Tudor Five-Year Transferable Guarantee, Subject to Exact Card Date\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eIncluded: Box, Papers, and Cards\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eCollector Provenance\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe Black Bay Fifty-Eight became one of Tudor’s defining modern references because it brought vintage-inspired proportions back into the center of the brand’s sports-watch lineup.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe original black version established the format, but the blue M79030B gave the same architecture a noticeably different personality.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eWhere the black Fifty-Eight leans warmer and more nostalgic, the blue version feels cleaner and more contemporary.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe 39 mm case, domed dial, aluminum bezel, no-date layout, and riveted bracelet all remain intact, but the color palette changes the character of the watch considerably.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eDesign Provenance\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe navy-blue dial is the key.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eIt is not a bright or tropical blue. In lower light it can read almost slate or midnight, while stronger light brings out a richer marine tone.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe matching blue bezel keeps the watch visually cohesive, while the silver-tone handset and markers sharpen the contrast.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe absence of gilt makes this version feel less vintage-coded than the black model, which is precisely why many collectors prefer it.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eTechnical Provenance\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe MT5402 is one of Tudor’s core modern manufacture movements.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eIt runs at 28,800 vibrations per hour, carries COSC chronometer certification, and provides approximately 70 hours of power reserve.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThat long reserve makes the watch especially practical in rotation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe rest of the specification is equally straightforward: screw-down crown, domed sapphire crystal, unidirectional dive bezel, and 200 meters of water resistance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eFrom the Case File\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe BB58 is one of those watches that gets the proportions right before anything else.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eAt 39 mm, it wears compactly without feeling small. The bracelet adds enough visual weight to keep the watch balanced, while the no-date dial preserves symmetry.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eCase 687 dates from 2023 and presents in Excellent Pre-Owned condition.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eIt includes its Box, Papers, and Cards and is currently sized for approximately a 7¾-inch wrist.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe 2023 date also means the watch should retain useful factory warranty coverage, subject to the exact card date.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eBST Verdict\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eOne of Tudor’s easiest modern sports watches to wear.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe blue dial and bezel give the Fifty-Eight a cleaner, cooler personality than the original black version, while the 39 mm case, MT5402 movement, 70-hour reserve, and 200-meter rating keep the formula mechanically serious.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eCase 687 adds a 2023 date, Excellent condition, BPC, and remaining warranty potential to one of the most balanced Black Bay configurations Tudor has produced.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eEvery case deserves a closer look.\u003c\/span\u003e\u003c\/p\u003e","brand":"Baker Street Timepieces","offers":[{"title":"Default Title","offer_id":58533071159599,"sku":null,"price":3410.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0948\/5359\/5439\/files\/BST_6812.jpg?v=1790206399","url":"https:\/\/bakerstreettimepieces.com\/products\/case-687-tudor-black-bay-58-blue-ref-79030b-0001","provider":"Baker Street Timepieces","version":"1.0","type":"link"}