OMEGA against TUDOR
OMEGA 210.30.42.20.01.001 vs TUDOR M25600TN-0001
11 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 | OMEGA Seamaster Diver 300M 42mm, black dial210.30.42.20.01.001 | TUDOR Pelagos 42, titanium and steel, 500mM25600TN-0001 |
|---|---|---|
| Case | Steel, 42 mm | 42mm titanium and steel case with satin finish |
| Water resistance | 30 bar (300 metres / 1,000 feet) | Waterproof to 500m (1,640 ft) |
| Crystal | Domed scratch-resistant sapphire crystal with anti-reflective treatment on both sides | Sapphire crystal |
| Dial | Black | Black with white index, date at 3 o'clock |
| Bracelet | Steel | Titanium bracelet |
| Clasp | Foldover clasp with comfort setting and diver extension | Folding clasp and safety catch in steel, with a bracelet extension system developed and patented by TUDOR |
| Calibre | Calibre OMEGA 8800 | Manufacture Calibre MT5612 |
| Movement | Self-winding movement with Co-Axial escapement, automatic winding in both directions | Self-winding mechanical movement with bidirectional rotor system |
| Power reserve | 55 hours | Approximately 70 hours |
| Certification | Master Chronometer, approved by METAS | COSC |
| Movement notes | Resistant to magnetic fields reaching 15,000 gauss. Free sprung-balance with silicon balance spring. Rhodium plated finish with Geneva waves in arabesque. Total product weight approximately 194 g. | 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
- 42 mm
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 | 13.56 mm | not stated |
|---|---|---|
| Lug to lug | 49.9 mm | not stated |
| Lug width | 20 mm | not stated |
| Bezel | not stated | Unidirectional rotatable bezel in titanium, graduated over 60 minutes with ceramic matt black disc and graduations with white luminescent material |
| Crown | not stated | Titanium winding crown with TUDOR logo in relief; helium escape valve at 9 o'clock |
| Frequency | 3.5 Hz | 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.
You will have to measure one of these
Lug to lug is published for the 210.30.42.20.01.001 but not for the M25600TN-0001. It is the figure that actually predicts fit, so measure the M25600TN-0001 yourself with callipers and say in the listing that the number is your own measurement, not the maker's.
Do not describe these the same way
500 metres on the M25600TN-0001 against 300 on the 210.30.42.20.01.001. 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.
One survives the weekend and one does not
70 hours on the M25600TN-0001 against 55 on the 210.30.42.20.01.001. Below about sixty hours a watch left off the wrist from Friday is stopped by Monday. Wind both fully at intake and confirm they reach the stated figure — a short reserve leaves a tired barrel nowhere to hide, and it is the kind of fault a buyer reports in week two.
Different case materials, different handling
The 210.30.42.20.01.001 is steel and the M25600TN-0001 is titanium. Different case materials mark, polish and refinish differently, so the condition language that fits one will mislead on the other. Photograph and describe each on its own terms.
What to check on each
210.30.42.20.01.001
- Confirm the calibre is the 8800 and not the 8900 used in the Aqua Terra. They are different movements with different reserves, and the 8800 has no time zone function to demonstrate.
- Check the crown screws down properly. At 300 metres this is a genuine dive rating and the crown is a primary seal, so any binding or reluctance to seat matters.
- Look at the anti-reflective coating on the inner crystal face as well as the outer. Interior hazing cannot be polished and means the crystal is due for replacement.
M25600TN-0001
- Describe the case as titanium and steel, which is what TUDOR publishes, rather than as all titanium. The clasp is specified in steel as well and the weight in hand reflects the mixture.
- Find the helium escape valve at 9 o'clock and confirm it is present and undamaged, since it is a functional valve rather than a decoration.
- Work the patented bracelet extension through its travel. It is an automatic spring mechanism, it sits inside the clasp, and a failed one is not obvious until the bracelet will not hold length.
Sources
- OMEGA official product page for reference 210.30.42.20.01.001 (Seamaster Diver 300M Co-Axial Master Chronometer 42 mm; steel) - Case: steel; 42 mm; Dial color: black; Crystal: domed scratch-resistant sapphire crystal with anti-reflective treatment on both sides; Water resistance: 30 bar (300 metres / 1000 feet); Movement: Calibre OMEGA 8800; self-winding movement with Co-Axial escapement; certified Master Chronometer approved by METAS; resistant to magnetic fields reaching 15000 gauss; free sprung-balance with silicon balance spring; automatic winding in both directions; rhodium plated finish with Geneva waves in arabesque; Power reserve: 55 hours; Frequency: 3.5 Hz; listed with a 5-year warranty; Re-read 2026-09-23, the page additionally publishes: Between lugs: 20 mm; Lug-to-lug: 49.90 mm; Thickness: 13.56 mm; Case diameter: 42 mm; Total product weight (approx.): 194 g; Type of Clasp: Foldover clasp with comfort setting and diver extension; Bracelet material: Steel — retrieved 2026-09-23
- TUDOR official product page for reference M25600TN-0001 (Pelagos 42; titanium and steel) - Case: 42mm titanium and steel case with satin finish; Waterproofness: Waterproof to 500m (1,640 ft); Bezel: Unidirectional rotatable bezel in titanium, graduated over 60 minutes with ceramic matt black disc and graduations with white luminescent material; Dial: Black with white index; date at 3 o'clock; Crystal: Sapphire crystal; Movement: Manufacture Calibre MT5612 (COSC); self-winding mechanical movement with bidirectional rotor system; Power Reserve: Power reserve of approximately 70 hours; Winding Crown: Titanium winding crown with TUDOR logo in relief; helium escape valve at 9 o'clock; Bracelet: Titanium bracelet with folding clasp and safety catch in steel with bracelet extension system developed and patented by TUDOR; Guarantee: Five-year transferable guarantee with no registration or periodic maintenance checks required — retrieved 2026-09-23
Not affiliated with OMEGA 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.