{"product_id":"case-731-tudor-black-bay-gmt-ref-m79830rb-0001","title":"Case #731 — Tudor Black Bay GMT Ref. M79830RB-0001","description":"\u003ch2\u003eCase #731 — Tudor Black Bay GMT \"Pepsi\"\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eRef.\u003c\/strong\u003e M79830RB-0001\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStatus:\u003c\/strong\u003e Available\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e Excellent Pre-Owned\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eScope:\u003c\/strong\u003e Box, Papers, and Cards\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eYear:\u003c\/strong\u003e 2022\u003c\/p\u003e\n\u003ch3\u003e🔎 Case Notes\u003c\/h3\u003e\n\u003cp\u003eFew modern watches carry their intent as plainly as this one. A black domed dial, a matte burgundy-and-blue 24-hour bezel, a red arrow-tipped 24-hour hand, and Tudor's angular Snowflake hands — the Black Bay GMT states its purpose before you have read a single line of text on the dial. Introduced at Baselworld in 2018, it was the first Black Bay to carry a GMT function, driven by the in-house, COSC-certified MT5652, with a blue-and-red bezel widely read as a nod to the Rolex GMT-Master \"Pepsi.\"\u003c\/p\u003e\n\u003cp\u003eWhat keeps this reference interesting rather than merely familiar is the engineering underneath. Tudor's calibre MT5652 is an integrated GMT rather than a module bolted onto a bought-in base, adapted from the manufacture architecture the brand introduced in 2015 — unusual at this level of the market. It carries a 70-hour power reserve and chronometer certification from the COSC.\u003c\/p\u003e\n\u003cp\u003eThis is a 2022 example in Excellent Pre-Owned condition, on the riveted steel bracelet with folding clasp and safety catch, currently sized to fit an approximately 7¾-inch wrist. It arrives as Box, Papers, and Cards. No specific condition defects were recorded during BST's physical inspection; the watch presents as a well-kept, honestly worn modern Tudor rather than a safe-queen.\u003c\/p\u003e\n\u003cp\u003eGiven the 2022 date, the watch may still fall within Tudor's five-year guarantee period — subject to the exact date shown on the warranty card and to Tudor's guarantee terms.\u003c\/p\u003e\n\u003ch3\u003e🕰️ The Evidence\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eReference:\u003c\/strong\u003e M79830RB-0001\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel \/ Collection:\u003c\/strong\u003e Tudor Black Bay GMT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eYear:\u003c\/strong\u003e 2022\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCase:\u003c\/strong\u003e 41 mm steel case with polished and satin finish\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCase Diameter:\u003c\/strong\u003e 41 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThickness:\u003c\/strong\u003e 14.6 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLug-to-Lug:\u003c\/strong\u003e Approximately 50 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLug Width:\u003c\/strong\u003e 22 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDial:\u003c\/strong\u003e Black, domed, with applied luminous hour markers and Snowflake hands\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrystal:\u003c\/strong\u003e Domed sapphire crystal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBezel:\u003c\/strong\u003e Bidirectional rotatable 48-notch steel bezel with 24-hour graduated anodised aluminium disc in matt burgundy and blue\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrown:\u003c\/strong\u003e Steel screw-down winding crown with the TUDOR rose in relief, with circular satin-brushed steel crown tube\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCaseback:\u003c\/strong\u003e Solid\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMovement:\u003c\/strong\u003e Manufacture Calibre MT5652 (COSC), self-winding mechanical movement with bidirectional rotor system, built-in architecture\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMovement Type:\u003c\/strong\u003e Automatic, 28,800 vph (4 Hz), with silicon balance spring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertification:\u003c\/strong\u003e COSC chronometer\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Reserve:\u003c\/strong\u003e Approximately 70 hours\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFunctions:\u003c\/strong\u003e Hours, minutes, seconds, date, GMT (second time zone)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater Resistance:\u003c\/strong\u003e 200 m (660 ft)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBracelet:\u003c\/strong\u003e Riveted steel bracelet with polished and satin finish\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClasp:\u003c\/strong\u003e Folding clasp with safety catch\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBracelet Fit:\u003c\/strong\u003e Approximately 7¾-inch wrist\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Excellent Pre-Owned\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFactory Warranty:\u003c\/strong\u003e Tudor five-year guarantee — remaining period subject to the warranty-card date and Tudor's guarantee terms\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded:\u003c\/strong\u003e Box, Papers, and Cards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e🌟 Collector Provenance\u003c\/h3\u003e\n\u003cp\u003eThe Black Bay line began as a vintage-informed diver, and for its first years that is all it was. The GMT changed the brief. After manufacture movements rolled out across Tudor's sport watches in 2016–2017, the 2018 Black Bay GMT became the first of the family to add a second time zone, powered by the COSC-certified MT5652. It was the moment the collection stopped being purely heritage-led and started being judged on capability.\u003c\/p\u003e\n\u003cp\u003eThe movement is the part collectors tend to argue about least. Tudor developed the MT5652 specifically for the Black Bay GMT, building it on the in-house MT5602 architecture first seen in 2015. The silicon balance spring gives it resistance to magnetic fields, and the balance is secured by a traversing bridge rather than a conventional cock. The second time zone operates as a jumping-hour arrangement, with an instantaneous date at 3 o'clock synchronised to that hand, plus stop-seconds for precise setting.\u003c\/p\u003e\n\u003cp\u003eThe -0001 configuration is the riveted steel bracelet variant — the most traditionally \"Black Bay\" of the options, and the one that ties the watch visually back to the mid-century Tudor divers the line draws on. Reference-level detail matters here: the same M79830RB case and dial were also sold on fabric (-0003), and the GMT calibre later appeared in the 39 mm Black Bay Pro and the steel-and-gold S\u0026amp;G, both of which arrived in 2022. This example is the original steel, burgundy-and-blue, riveted-bracelet expression.\u003c\/p\u003e\n\u003ch3\u003e🌟 Design Provenance\u003c\/h3\u003e\n\u003cp\u003eThe colour scheme is the reason this watch is instantly legible across a room, and Tudor handled it carefully. The rotating bezel takes its deep blue and burgundy scheme from elsewhere in the Black Bay line, but renders it in a matte finish — which is why the \"Pepsi\" shorthand fits the watch without the watch looking like an imitation of anything. Matte anodised aluminium reads as muted and slightly dusty in daylight, closer to a tool instrument than a gloss ceramic insert.\u003c\/p\u003e\n\u003cp\u003eThe rest of the design language is pure Tudor rather than borrowed. The angular Snowflake hands are a hallmark of the brand's own diving history, and here the 24-hour hand is given a red arrowhead so the two time displays never visually collide. The satin-brushed steel winding crown tube was new to the Black Bay line with this generation — a small detail, but one that quietly separates the GMT era cases from the earlier Black Bays with their contrasting tubes.\u003c\/p\u003e\n\u003ch3\u003e🧾 From the Case File\u003c\/h3\u003e\n\u003cp\u003eIn practice this is a travel watch that is unbothered by the rest of your life. 200 metres of water resistance and a 41 mm steel case mean it is a genuine diver first and a GMT second, and because the bezel is bidirectional and 24-hour graduated, it can be used alongside the GMT hand to track a third time zone.\u003c\/p\u003e\n\u003cp\u003eThe 70-hour power reserve is the specification owners notice most. Set it down on a Friday evening and it is still running correctly on Monday morning — no resetting of a date that has drifted, no rewinding before the week starts. COSC certification brings a rated tolerance of -4\/+6 seconds per day; BST has not measured this example's timing, so that figure describes the specification rather than a tested result.\u003c\/p\u003e\n\u003cp\u003eOn the wrist, the numbers to weigh are 14.6 mm of case thickness and a 22 mm lug width, with roughly 50 mm across the lugs. This is a substantial watch with real presence, but the lug-to-lug keeps it wearable on a mid-sized wrist, and the riveted bracelet's tapering profile helps it sit closer than the thickness suggests. It is currently sized for an approximately 7¾-inch wrist; links can be added or removed by any competent watchmaker, subject to what remains in the box.\u003c\/p\u003e\n\u003cp\u003eAgainst buying new, the arguments here are straightforward: a 2022 example in Excellent Pre-Owned condition, complete with Box, Papers, and Cards, and potentially still inside Tudor's five-year guarantee window depending on the card date — a guarantee Tudor states is transferable and requires neither registration nor periodic maintenance checks.\u003c\/p\u003e\n\u003ch3\u003e🗝️ BST Verdict\u003c\/h3\u003e\n\u003cp\u003eThe Black Bay GMT is the reference that proved Tudor could build a genuinely integrated complication and still make it look like a tool from 1965. This is the core configuration — black dial, matte burgundy-and-blue bezel, riveted steel bracelet — in Excellent Pre-Owned condition, dated 2022, and complete with Box, Papers, and Cards.\u003c\/p\u003e\n\u003cp\u003eFor a buyer who wants one steel watch that handles water, travel and daily wear without apology, this is a straightforward and well-documented example of it.\u003c\/p\u003e\n\u003cp\u003e👉 Every case deserves a closer look.\u003c\/p\u003e","brand":"Baker Street Timepieces","offers":[{"title":"Default Title","offer_id":58722703835439,"sku":null,"price":3450.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0948\/5359\/5439\/files\/BST_7192.jpg?v=1793052423","url":"https:\/\/bakerstreettimepieces.com\/products\/case-731-tudor-black-bay-gmt-ref-m79830rb-0001","provider":"Baker Street Timepieces","version":"1.0","type":"link"}