OMEGA against Rolex
OMEGA 210.30.42.20.01.001 vs Rolex 126610LN
12 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 | OMEGA Seamaster Diver 300M 42mm, black dial210.30.42.20.01.001 | |
|---|---|---|
| Case | Steel, 42 mm | Oyster, 41 mm, Oystersteel. Monobloc middle case, screw-down case back and winding crown |
| Diameter | 42 mm | 41 mm |
| Water resistance | 30 bar (300 metres / 1,000 feet) | Waterproof to 300 metres / 1,000 feet |
| Crystal | Domed scratch-resistant sapphire crystal with anti-reflective treatment on both sides | Scratch-resistant sapphire, Cyclops lens over the date |
| Dial | Black | Black, with highly legible Chromalight display with long-lasting blue luminescence |
| Bracelet | Steel | Oyster, three-piece solid links, Oystersteel |
| Clasp | Foldover clasp with comfort setting and diver extension | Folding Oysterlock safety clasp with Rolex Glidelock extension system |
| Calibre | Calibre OMEGA 8800 | Calibre 3235, Manufacture Rolex |
| Movement | Self-winding movement with Co-Axial escapement, automatic winding in both directions | Perpetual, mechanical, self-winding; bidirectional self-winding via Perpetual rotor |
| Power reserve | 55 hours | Approximately 70 hours |
| Certification | Master Chronometer, approved by METAS | Superlative Chronometer (official chronometer certification + Rolex certification after casing) |
| 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. | 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. |
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 60-minute graduated, scratch-resistant Cerachrom insert in black ceramic, numerals and graduations coated in platinum |
| Case back | not stated | Screw-down |
| Crown | not stated | Screw-down, Triplock triple waterproofness system |
| 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 126610LN. It is the figure that actually predicts fit, so measure the 126610LN yourself with callipers and say in the listing that the number is your own measurement, not the maker's.
One survives the weekend and one does not
70 hours on the 126610LN 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 movements to verify and to service
The 210.30.42.20.01.001 runs the Calibre OMEGA 8800 and the 126610LN the Calibre 3235, Manufacture Rolex. 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
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.
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.
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
- 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
Not affiliated with OMEGA or Rolex. Specifications are read from each manufacturer's own published documentation on the dates shown and may change; the manufacturer's current documentation governs.