{"product_id":"case-712-tudor-bb-gmt-coke-ref-m7939g1a0nru-0001","title":"Case #712 — Tudor Black Bay 58 GMT “Coke” Ref. M7939G1A0NRU-0001","description":"\u003cp\u003e\u003cstrong\u003eCase #712 — Tudor Black Bay 58 GMT “Coke” Ref. M7939G1A0NRU-0001\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-pm-slice=\"1 1 []\"\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\u003e\u003cspan\u003eCase Notes\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Black Bay 58 GMT takes Tudor’s travel-watch formula and finally puts it into the proportions collectors had been asking for.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAt 39 mm wide and only 12.8 mm thick, it is dramatically more compact than the original Black Bay GMT, but it loses none of the functionality. The defining feature is the bidirectional 24-hour bezel with its black and burgundy aluminum insert, quickly earning the watch its enthusiast nickname: “Coke.”\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAgainst the domed black dial, Tudor uses gilt-tone applied markers and hands to give the watch the warmer character associated with the Black Bay family. The red GMT hand ties directly into the burgundy half of the bezel and allows a second time zone to be read at a glance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eInside is Tudor’s Manufacture Calibre MT5450-U, an integrated GMT movement certified both by COSC and METAS as a Master Chronometer. It offers a 65-hour power reserve, silicon hairspring, resistance to magnetic fields, and a jumping local-hour hand that makes changing time zones exceptionally straightforward.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis example dates from 2024 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\u003e\u003cspan\u003eAs a 2024 example, it retains substantial coverage under Tudor’s five-year transferable guarantee, subject to the exact warranty-card date and Tudor’s terms.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Evidence\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eReference: M7939G1A0NRU-0001\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eModel: Black Bay 58 GMT\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eYear: 2024\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eCase: Stainless Steel, Polished and Satin Finished\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eCase Diameter: 39 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eCase Thickness: 12.8 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eLug Width: 20 mm\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eDial: Domed Black with Gilt-Tone Applied Markers\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eCrystal: Domed Sapphire\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBezel: Bidirectional 24-Hour Bezel with Black and Burgundy Anodized Aluminum Insert\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eCrown: Screw-Down with Tudor Rose\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eMovement: Tudor Manufacture Calibre MT5450-U\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eMovement Type: Automatic Integrated GMT\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eCertification: COSC and METAS Master Chronometer\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eFrequency: 28,800 VPH\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eJewels: 34\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003ePower Reserve: Approximately 65 Hours\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eFunctions: Hours, Minutes, Central Seconds, GMT \/ 24-Hour Display, Date, Jumping Local Hour\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eWater Resistance: 200 meters \/ 660 feet\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eBracelet: Three-Link Rivet-Style Stainless Steel\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eClasp: Tudor T-fit\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\u003e\u003cspan\u003eCollector Provenance\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe significance of the Black Bay 58 GMT is largely about proportion.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTudor had offered a Black Bay GMT since 2018, but that watch carried the size and thickness of the full-size Black Bay platform. The 58 GMT brought the complication into the smaller 39 mm architecture that had made the Black Bay Fifty-Eight so successful.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIt was not simply a downsized case.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTudor developed the MT5450-U specifically around the compact format, producing an integrated GMT movement only 6.14 mm thick while retaining a true jumping local-hour function.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe black-and-burgundy bezel immediately gave the watch an identity of its own. Collectors quickly adopted the familiar “Coke” nickname, although Tudor itself describes the colors simply as black and burgundy.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDesign Provenance\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis is a travel watch that still looks unmistakably like a Black Bay.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe domed black dial, gilt-tone details, Snowflake hour hand, rivet-style bracelet, and aluminum bezel all lean into Tudor’s vintage-inspired design vocabulary.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe GMT architecture adds color without overwhelming it.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe bezel divides day and night between black and burgundy, while the red 24-hour hand introduces a third layer of information without making the dial feel crowded.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAt 39 mm and 12.8 mm thick, the watch also avoids the visual and physical bulk associated with many mechanical GMTs.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTechnical Provenance\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe MT5450-U is one of the most technically advanced movements currently used in the Black Bay family.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIt is independently certified by both COSC and METAS, with Tudor’s Master Chronometer specification covering precision, power reserve, water resistance, and resistance to magnetic fields up to 15,000 gauss.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe local hour hand can be advanced or reversed independently in one-hour increments, with the date synchronized to that adjustment.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThat is the practical definition of a true travel GMT: when arriving in a new time zone, local time can be changed without stopping the movement or disturbing the minutes, seconds, or home-time indication.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe movement provides approximately 65 hours of power reserve and uses a silicon balance spring.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFrom the Case File\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe Black Bay 58 GMT solves the biggest objection many buyers had to Tudor’s earlier GMT: size.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIt delivers a true jumping-hour GMT, date, rotating 24-hour bezel, 200-meter water resistance, and Master Chronometer certification in a case that wears much closer to the familiar Black Bay 58.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCase 712 dates from the model’s launch year of 2024 and presents in Excellent Pre-Owned condition.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\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\u003e\u003cspan\u003eBuy with Confidence\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBST guarantees the authenticity of every watch we sell and provides a 30-day mechanical performance guarantee under normal use.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAccuracy may vary with age and service history, and water resistance is not guaranteed unless specifically stated and pressure-tested.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eBST Verdict\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe GMT many Tudor collectors were waiting for.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA 39 mm case, black-and-burgundy “Coke” bezel, true jumping local-hour GMT, T-fit bracelet, 65-hour reserve, and dual COSC\/METAS certification make the Black Bay 58 GMT significantly more than a smaller version of the earlier model.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eCase 712 adds a launch-year 2024 date, Excellent condition, complete BPC presentation, and substantial remaining factory warranty to one of Tudor’s strongest recent releases.\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":58586432143663,"sku":null,"price":4350.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0948\/5359\/5439\/files\/BST_6971.jpg?v=1790810732","url":"https:\/\/bakerstreettimepieces.com\/products\/case-712-tudor-bb-gmt-coke-ref-m7939g1a0nru-0001","provider":"Baker Street Timepieces","version":"1.0","type":"link"}