Tudor
Black Bay GMT
79830RB
Tudor's in-house GMT in the classic Black Bay idiom
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Overview
The Tudor Black Bay GMT reference 79830RB is a 41 mm stainless steel sports watch that adds a two-timezone complication to the long-running Black Bay family. Powered by Tudor's own manufacture calibre MT5652, it pairs genuine in-house credentials with the heritage-inflected aesthetics the line is known for. Dial options in black and opaline give collectors a choice between a more legible, tool-watch character and a softer, vintage-leaning tone.
History
Tudor introduced the Black Bay GMT to the reference 79830RB in 2018, marking a significant moment for the brand as it brought a GMT function into the Black Bay collection for the first time. The watch arrived alongside growing collector enthusiasm for Tudor's in-house movement programme, which had been steadily maturing since the mid-2010s. The Black Bay family itself draws on Tudor's deep archive of diver and sport references, and the GMT variant extended that heritage into the realm of traveller's watches. The reference has remained in production continuously, cementing its place as a cornerstone of the modern Tudor catalogue.
Notable points
- Calibre MT5652 is a manufacture movement developed entirely in-house by Tudor, featuring a bidirectional GMT hand that can be set independently of the local hour hand.
- The 41 mm stainless steel case follows the Black Bay family's characteristic proportions, including the distinctive "snowflake" hands and domed crystal.
- A two-tone bezel insert — combining red and blue sections — references the classic "Pepsi" colour scheme long associated with GMT watches in the sport-watch tradition.
- Dial availability in both black and opaline variants allows the reference to serve collectors who favour either a crisp, high-contrast read or a warmer, vintage-adjacent aesthetic.
- The MT5652 movement carries COSC chronometer certification and a silicon balance spring, underlining its technical pedigree within a mid-sized sport watch.
Specifications
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