Rolex against TUDOR
Rolex 126610LN vs TUDOR M7939A1A0NU-0001
13 published specifications differ between these two. Every figure below is what the manufacturer states for that reference; nothing is inferred from the other watch.
What differs
| Specification | TUDOR Black Bay 58, 39mm steel on braceletM7939A1A0NU-0001 | |
|---|---|---|
| Case | Oyster, 41 mm, Oystersteel. Monobloc middle case, screw-down case back and winding crown | 39mm stainless steel case with polished and satin finishes |
| Diameter | 41 mm | 39 mm |
| Water resistance | Waterproof to 300 metres / 1,000 feet | Waterproof to 200m (660 ft) |
| Crystal | Scratch-resistant sapphire, Cyclops lens over the date | Domed sapphire crystal |
| Bezel | Unidirectional rotatable 60-minute graduated, scratch-resistant Cerachrom insert in black ceramic, numerals and graduations coated in platinum | Unidirectional rotatable bezel in stainless steel with anodised aluminium insert |
| Dial | Black, with highly legible Chromalight display with long-lasting blue luminescence | Matt black, domed, with applied hour markers |
| Crown | Screw-down, Triplock triple waterproofness system | Stainless steel screw-down winding crown with the TUDOR rose in relief |
| Bracelet | Oyster, three-piece solid links, Oystersteel | 5-link stainless steel bracelet with polished and satin finishes |
| Clasp | Folding Oysterlock safety clasp with Rolex Glidelock extension system | TUDOR "T-fit" clasp |
| Calibre | Calibre 3235, Manufacture Rolex | Manufacture Calibre MT5400-U |
| Movement | Perpetual, mechanical, self-winding; bidirectional self-winding via Perpetual rotor | Self-winding mechanical movement with bidirectional rotor system |
| Power reserve | Approximately 70 hours | 65-hour power reserve |
| Certification | Superlative Chronometer (official chronometer certification + Rolex certification after casing) | COSC and METAS certified |
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.
| Thickness | not stated | 11.7 mm |
|---|---|---|
| Lug width | not stated | 20 mm |
| Case back | Screw-down | not stated |
| Movement notes | Precision −2/+2 sec/day after casing. Paramagnetic blue Parachrom hairspring with high-performance Paraflex shock absorbers. Instantaneous date with rapid setting and stop-seconds. | 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.
These reach different buyers
41 mm on the 126610LN against 39 mm on the M7939A1A0NU-0001. Diameter is a poor predictor of how a watch actually sits, but it is the field buyers filter on, so the two land in front of different people. Do not let one listing's photographs or copy stand in for the other.
Do not describe these the same way
300 metres on the 126610LN against 200 on the M7939A1A0NU-0001. 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 126610LN runs the Calibre 3235, Manufacture Rolex and the M7939A1A0NU-0001 the Manufacture Calibre MT5400-U. 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
126610LN
- Check the platinum coating in the bezel numerals under magnification. Rolex coats the graduations in platinum, and wear or inconsistency there is a strong signal the insert is not original.
- Work the Glidelock extension through its full range of settings and confirm each position locks positively. It is a mechanism, it is used constantly, and a worn one is immediately obvious to a buyer.
- Verify the crown screws down cleanly onto the Triplock system. A crown that binds or will not seat is the single most consequential fault on a 300-metre case.
M7939A1A0NU-0001
- Verify the calibre is MT5400-U rather than an earlier MT5402. The Master Chronometer version is a different movement, and the two are easy to conflate in a listing written from memory.
- Inspect the anodised aluminium bezel insert closely. Aluminium marks in a way ceramic does not, and insert condition is one of the larger swings in desirability on this reference.
- Work the five-link bracelet's T-fit clasp through its adjustment range, and check the links for stretch at the pins.
Sources
- Rolex official product page for reference 126610LN (Submariner Date; Oyster 41 mm; Oystersteel) - Model case: Oyster; 41 mm; Oystersteel; Oyster architecture: monobloc middle case; screw-down case back and winding crown; Diameter: 41 mm; Material: Oystersteel; Bezel: unidirectional rotatable 60-minute graduated; scratch-resistant Cerachrom insert in black ceramic with numerals and graduations coated in platinum; Winding crown: screw-down with Triplock triple waterproofness system; Crystal: scratch-resistant sapphire with Cyclops lens over the date; Water resistance: waterproof to 300 metres / 1000 feet; Movement: perpetual; mechanical; self-winding; Calibre: 3235; Manufacture Rolex; Precision: -2/+2 sec/day after casing; Functions: centre hour; minute and seconds hands; instantaneous date with rapid setting; 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: Oyster; three-piece solid links; Oystersteel; Clasp: folding Oysterlock safety clasp with Rolex Glidelock extension system; Dial: black with highly legible Chromalight display with long-lasting blue luminescence; Certification: Superlative Chronometer (official chronometer certification plus Rolex certification after casing) — retrieved 2026-09-22
- TUDOR official product page for reference M7939A1A0NU-0001 (Black Bay 58; 39mm steel case; steel bracelet) - Case: 39mm stainless steel case with polished and satin finishes; Lugs: 20mm lug width; Case thickness: 11.7mm; Waterproofness: waterproof to 200m (660 ft); Bezel: unidirectional rotatable bezel in stainless steel with anodised aluminium insert; Dial: matt black; domed; with applied hour markers; Crystal: domed sapphire crystal; Movement: Manufacture Calibre MT5400-U (COSC and METAS certified); self-winding mechanical movement with bidirectional rotor system; Power Reserve: 65-hour power reserve; Winding Crown: stainless steel screw-down winding crown with the TUDOR rose in relief; Bracelet: 5-link stainless steel bracelet with polished and satin finishes with TUDOR T-fit clasp; the unidirectional rotatable bezel rotates in one direction only and is deliberately harder to turn when the zero marker is at 12 o'clock to avoid inadvertent rotation — retrieved 2026-09-22
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.