TUDOR · Pelagos and Pelagos
TUDOR M25407N-0001 vs TUDOR M2543C1A7NU-0001
12 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 Pelagos 39, grade 2 titaniumM25407N-0001 | TUDOR Pelagos Ultra, titaniumM2543C1A7NU-0001 |
|---|---|---|
| Case | 39mm grade 2 titanium case with satin finish | 43mm titanium case with satin finish and helium escape valve |
| Diameter | 39 mm | 43 mm |
| Water resistance | Waterproof to 200m (660 ft) | Waterproof to 1,000m (3,280 ft) |
| Crystal | Sapphire crystal | Domed sapphire crystal |
| Bezel | Grade 2 titanium unidirectional rotating bezel with insert in sunray satin finish ceramic and luminous material | Unidirectional rotating bezel in titanium with matte ceramic insert and luminous material |
| Dial | Black sunray satin finish with sandblasted flange and monobloc luminescent ceramic composite hour markers | Black matte dial with sandblasted flange |
| Crown | Grade 2 titanium screw-down crown, adorned with the TUDOR shield in relief | Titanium screw-down crown, adorned with the TUDOR shield in relief |
| Bracelet | Titanium bracelet | Titanium three-link bracelet with safety catch and diver's extension with new visual indicator system |
| Clasp | TUDOR T-fit folding clasp, safety catch and diver's extension | TUDOR "T-fit" folding clasp |
| Calibre | Manufacture Calibre MT5400 | Manufacture Calibre MT5612-U |
| Power reserve | Approximately 70 hours | 65-hour power reserve |
| Certification | COSC | COSC and METAS certified |
What is identical
Worth knowing as much as the differences: these are the specifications you cannot use to tell the two apart.
- Movement
- Self-winding mechanical movement with bidirectional rotor system
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 | 14.5 mm |
|---|---|---|
| Lug width | not stated | 22 mm |
| Movement notes | TUDOR states a five-year transferable guarantee with no registration or periodic maintenance checks required. | 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
43 mm on the M2543C1A7NU-0001 against 39 mm on the M25407N-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
1,000 metres on the M2543C1A7NU-0001 against 200 on the M25407N-0001 — not a variation on the same watch but a different class of one, built around a case and crystal designed for depth. Expect different buyers, different questions, and a different service conversation. Never carry the M2543C1A7NU-0001's rating into the M25407N-0001's listing.
Different movements to verify and to service
The M25407N-0001 runs the Manufacture Calibre MT5400 and the M2543C1A7NU-0001 the Manufacture Calibre MT5612-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
M25407N-0001
- Grade the titanium against titanium rather than steel. It scuffs greyer and broader, so a well-kept titanium case reads worse under a raking light than steel in the same condition.
- Check the crown is titanium as specified rather than a steel replacement, since TUDOR names the material for the crown separately on this reference.
- Run the T-fit clasp through every position and confirm each one locks. It is a toolless rapid adjustment and it is the mechanism most used on the bracelet.
M2543C1A7NU-0001
- Test the helium escape valve turns freely and seats. It is a functional component on a saturation-rated case, not decoration, and a seized one is a service item.
- Check the diver's extension and its visual indicator operate through the full range — it is the mechanism most likely to have been fiddled with and least likely to have been used properly.
- Look at the titanium closely under light. It marks differently from steel, takes a scuff more readily, and refinishing it is not the routine job that polishing steel is.
Sources
- TUDOR official product page for reference M25407N-0001 (Pelagos 39; 39mm grade 2 titanium) - Case: 39mm grade 2 titanium case with satin finish; Waterproofness: Waterproof to 200m (660 ft); Bezel: Grade 2 titanium unidirectional rotating bezel with insert in sunray satin finish ceramic and luminous material; Dial: Black sunray satin finish with sandblasted flange and monobloc luminescent ceramic composite hour markers; Crystal: Sapphire crystal; Movement: Manufacture Calibre MT5400 (COSC); self-winding mechanical movement with bidirectional rotor system; Power Reserve: Power reserve of approximately 70 hours; Winding Crown: Grade 2 titanium screw-down crown, adorned with the TUDOR shield in relief; Bracelet: Titanium bracelet with TUDOR T-fit folding clasp, safety catch and diver's extension; Guarantee: Five-year transferable guarantee with no registration or periodic maintenance checks required — retrieved 2026-09-23
- TUDOR official product page for reference M2543C1A7NU-0001 (Pelagos Ultra; titanium bracelet) - Case: 43mm titanium case with satin finish and helium escape valve; Lugs: 22mm lug width; Case thickness: 14.5mm; Waterproofness: waterproof to 1000m (3280 ft); Bezel: unidirectional rotating bezel in titanium with matte ceramic insert and luminous material; Dial: black matte dial with sandblasted flange; Crystal: domed sapphire crystal; Movement: Manufacture Calibre MT5612-U (COSC and METAS certified); self-winding mechanical movement with bidirectional rotor system; Power Reserve: 65-hour power reserve; Winding Crown: titanium screw-down crown adorned with the TUDOR shield in relief; Bracelet: titanium three-link bracelet with TUDOR T-fit folding clasp; safety catch and diver's extension with new visual indicator system — retrieved 2026-09-22
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.