Rolex against TUDOR
Rolex 126710GRNR vs TUDOR M79830RB-0001
13 published specifications differ between these two, and 1 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 | Oyster, 40 mm, Oystersteel. Monobloc middle case, screw-down case back and winding crown | 41mm steel case with polished and satin finish |
| Diameter | 40 mm | 41 mm |
| Water resistance | Waterproof to 100 metres / 330 feet | Waterproof to 200m (660 ft) |
| Crystal | Scratch-resistant sapphire | Domed sapphire crystal |
| Bezel | Bidirectional rotatable 24-hour graduated bezel, two-colour grey and black Cerachrom insert in ceramic, moulded numerals and graduations | Bidirectional rotatable 48-notch bezel in steel with a 24-hour graduated anodised aluminium disc in matt burgundy and blue |
| Dial | Black, with highly legible Chromalight display with long-lasting blue luminescence | Black, domed |
| Crown | Screw-down, Triplock triple waterproofness system | Steel screw-down winding crown with the TUDOR rose in relief, with circular satin-brushed steel winding crown tube |
| Bracelet | Jubilee, five-piece links, Oystersteel | Riveted steel bracelet with polished and satin finish |
| Clasp | Folding Oysterlock safety clasp with Easylink 5 mm comfort extension link | Folding clasp with safety catch |
| Calibre | Calibre 3285, Manufacture Rolex | Manufacture Calibre MT5652 |
| Movement | Perpetual, mechanical, self-winding, GMT function; bidirectional self-winding via Perpetual rotor | Self-winding mechanical movement with bidirectional rotor system, built-in architecture |
| Certification | Superlative Chronometer (official chronometer certification + Rolex certification after casing) | COSC |
| Movement notes | Precision −2/+2 sec/day after casing. Second time zone with independent rapid-setting of the hour hand, 24-hour display, instantaneous date, stop-seconds. | 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.
- Power reserve
- Approximately 70 hours
Stated for one, not the other
These rows cannot be compared, because one maker publishes the figure and the other does not. An empty cell is a gap in the manufacturer's documentation, not a gap in the watch — and not a licence to fill it in from the other column.
| Case back | Screw-down | not stated |
|---|
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.
Do not describe these the same way
200 metres on the M79830RB-0001 against 100 on the 126710GRNR. Both are more than daily life asks for, so the number is a listing-accuracy question rather than a practical one: quote each watch its own figure, and remember that neither rating survives an unserviced case by itself.
Different movements to verify and to service
The 126710GRNR runs the Calibre 3285, Manufacture Rolex 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
126710GRNR
- Set the local hour hand forward and back in one-hour jumps and confirm it moves alone. The 24-hour hand and the minutes must stay put — that independence is the whole complication.
- Check where the two bezel colours meet. A two-colour Cerachrom insert has a defined transition, and it should sit precisely on the graduation rather than drifting to one side.
- Look along the Jubilee bracelet for stretch. Five-piece links mean many more pins than an Oyster bracelet of the same length, and Jubilees show their age in the hand before they show it in photographs.
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
- Rolex official product page for reference 126710GRNR (GMT-Master II; Oyster 40 mm; Oystersteel) - Model case: Oyster; 40 mm; Oystersteel; Oyster architecture: monobloc middle case; screw-down case back and winding crown; Diameter: 40 mm; Material: Oystersteel; Bezel: bidirectional rotatable 24-hour graduated bezel with two-colour grey and black Cerachrom insert in ceramic and moulded numerals and graduations; Winding crown: screw-down with Triplock triple waterproofness system; Crystal: scratch-resistant sapphire; Water resistance: waterproof to 100 metres / 330 feet; Movement: perpetual; mechanical; self-winding with GMT function; Calibre: 3285; Manufacture Rolex; Precision: -2/+2 sec/day after casing; Functions: centre hour; minute and seconds hands; 24-hour display; second time zone with independent rapid-setting of the hour hand; instantaneous date; stop-seconds for precise time setting; Oscillator: paramagnetic blue Parachrom hairspring with high-performance Paraflex shock absorbers; Winding: bidirectional self-winding via Perpetual rotor; Power reserve: approximately 70 hours; Bracelet: Jubilee; five-piece links; Oystersteel; Clasp: folding Oysterlock safety clasp with Easylink 5 mm comfort extension link; Dial: black with highly legible Chromalight display with long-lasting blue luminescence; Certification: Superlative Chronometer — retrieved 2026-09-22
- 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 Rolex or TUDOR. Specifications are read from each manufacturer's own published documentation on the dates shown and may change; the manufacturer's current documentation governs.