TUDOR · Black Bay Chrono and Black Bay GMT
TUDOR M79360N-0011 vs TUDOR M79830RB-0001
9 published specifications differ between these two, and 5 are identical. Every figure below is what the manufacturer states for that reference; nothing is inferred from the other watch.
What differs
| Specification | TUDOR Black Bay GMT 41mm, burgundy and blue bezelM79830RB-0001 | |
|---|---|---|
| Case | 41mm stainless steel case with polished and satin-brushed finishes | 41mm steel case with polished and satin finish |
| Bezel | Fixed stainless steel bezel with matt black anodised aluminium disc with tachymetric scale and silver markings | Bidirectional rotatable 48-notch bezel in steel with a 24-hour graduated anodised aluminium disc in matt burgundy and blue |
| Dial | Black with silver counters, domed, date at 6 o'clock | Black, domed |
| Crown | Stainless steel screw-down winding crown with the TUDOR rose in relief; stainless steel screw-down pushers at 2 and 4 o'clock | Steel screw-down winding crown with the TUDOR rose in relief, with circular satin-brushed steel winding crown tube |
| Bracelet | 3-link stainless steel rivet-style bracelet with polished and satin-brushed finishes | Riveted steel bracelet with polished and satin finish |
| Clasp | TUDOR T-fit rapid adjustment clasp | Folding clasp with safety catch |
| Calibre | Manufacture Calibre MT5813 | Manufacture Calibre MT5652 |
| Movement | Self-winding mechanical chronograph movement with bidirectional rotor system | Self-winding mechanical movement with bidirectional rotor system, built-in architecture |
| Movement notes | Chronograph function with a date at 6 o'clock. TUDOR states a five-year transferable guarantee with no registration or periodic maintenance checks required. | TUDOR states a five-year transferable guarantee with no registration or periodic maintenance checks required. |
What is identical
Worth knowing as much as the differences: these are the specifications you cannot use to tell the two apart.
- Diameter
- 41 mm
- Water resistance
- Waterproof to 200m (660 ft)
- Crystal
- Domed sapphire crystal
- Power reserve
- Approximately 70 hours
- Certification
- COSC
What the differences cost you
Each note below follows from the published figures in the tables above — what they mean for intake, for a listing, and for the handover. Nothing here estimates a price or a margin.
Different movements to verify and to service
The M79360N-0011 runs the Manufacture Calibre MT5813 and the M79830RB-0001 the Manufacture Calibre MT5652. Two consequences at intake: the service history that is normal for one calibre is not evidence about the other, and the calibre is the check that catches a movement swapped into the wrong case. Confirm the movement matches the reference rather than assuming it from the dial.
What to check on each
M79360N-0011
- Unscrew both pushers before testing the chronograph. They thread down against the case and will not operate until released, and pressing a screwed-down pusher can damage its tube.
- Screw both pushers and the crown back down afterwards and confirm each seats flush, since the 200-metre rating depends on all three.
- Run the chronograph for several hours rather than clicking it, because a movement short of amplitude gives itself away under the load of a running chronograph.
M79830RB-0001
- Grade the bezel disc as anodised aluminium. It fades and dents rather than chipping, so a paler burgundy on a used example is ageing rather than damage.
- Count the bezel through a full revolution against the specified 48 notches and confirm it turns freely both ways, which is correct for a timezone bezel.
- Check the crown tube is the circular satin-brushed steel type specified, since TUDOR calls the tube out separately on this reference.
Sources
- TUDOR official product page for reference M79360N-0011 (Black Bay Chrono; 41mm steel; tachymetric bezel) - Case: 41mm stainless steel case with polished and satin-brushed finishes; Waterproofness: Waterproof to 200m (660 ft); Bezel: Fixed stainless steel bezel with matt black anodised aluminium disc with tachymetric scale and silver markings; Dial: Black with silver counters, domed; date at 6 o'clock; Crystal: Domed sapphire crystal; Movement: Manufacture Calibre MT5813 (COSC) with chronograph function; self-winding mechanical chronograph movement with bidirectional rotor system; Power Reserve: Power reserve of approximately 70 hours; Winding Crown: Stainless steel screw-down winding crown with the TUDOR rose in relief; stainless steel screw-down pushers at 2 o'clock and 4 o'clock; Bracelet: 3-link stainless steel rivet-style bracelet with polished and satin-brushed finishes, with TUDOR T-fit rapid adjustment clasp; Guarantee: Five-year transferable guarantee with no registration or periodic maintenance checks required — retrieved 2026-09-23
- TUDOR official product page for reference M79830RB-0001 (Black Bay GMT; 41mm steel; burgundy and blue bezel) - Case: 41mm steel case with polished and satin finish; Waterproofness: Waterproof to 200m (660 ft); Bezel: Bidirectional rotatable 48 notches bezel in steel with 24-hour graduated anodised aluminium disc in matt burgundy and blue; Dial: Black, domed; Crystal: Domed sapphire crystal; Movement: Manufacture Calibre MT5652 (COSC); self-winding mechanical movement with bidirectional rotor system; built-in architecture; Power Reserve: Power reserve of approximately 70 hours; Winding Crown: Steel screw-down winding crown, with the TUDOR rose in relief, with circular satin-brushed steel winding crown tube; Bracelet: Riveted steel bracelet with polished and satin finish with folding clasp and safety catch; Guarantee: Five-year transferable guarantee with no registration or periodic maintenance checks required — retrieved 2026-09-23
Not affiliated with TUDOR. Specifications are read from each manufacturer's own published documentation on the dates shown and may change; the manufacturer's current documentation governs.