OMEGA · Seamaster Planet Ocean 6000M and Seamaster 300
OMEGA 215.30.46.21.03.002 vs OMEGA 234.30.41.21.03.002
10 published specifications differ between these two, and 4 are identical. Every figure below is what the manufacturer states for that reference; nothing is inferred from the other watch.
What differs
| Specification | OMEGA Ultra Deep 6000M, O-MEGASTEEL, 45.5mm, blue dial215.30.46.21.03.002 | OMEGA Seamaster 300 Co-Axial Master Chronometer 41mm, blue dial234.30.41.21.03.002 |
|---|---|---|
| Case | O-MEGASTEEL, 45.5 mm | Steel, 41 mm |
| Diameter | 45.5 mm | 41 mm |
| Thickness | 18.12 mm | 13.85 mm |
| Lug to lug | 51.9 mm | 48 mm |
| Lug width | 22 mm | 21 mm |
| Water resistance | 600 bar (6000 metres / 20000 feet) | 30 bar (300 metres / 1000 feet) |
| Crystal | Domed, protuberant and scratch-resistant sapphire crystal with anti-reflective treatment on both sides | Domed, scratch-resistant sapphire crystal with anti-reflective treatment inside |
| Bracelet | O-MEGASTEEL | Steel |
| Clasp | Foldover clasp with comfort setting and diver extension | Foldover clasp with comfort setting |
| Movement notes | Listed by OMEGA as a Master Chronometer certified watch. Total product weight approximately 254 g. | Listed by OMEGA as a Master Chronometer certified watch. Total product weight approximately 156 g. |
What is identical
Worth knowing as much as the differences: these are the specifications you cannot use to tell the two apart.
- Dial
- Blue
- Calibre
- Omega 8912
- Movement
- Self winding
- Power reserve
- 60 hours
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.
One of these is the harder fit
Lug to lug is 51.9 mm on the 215.30.46.21.03.002 against 48 mm on the 234.30.41.21.03.002 — a 3.9 mm difference across the wrist. Diameter is what buyers ask about; lug to lug is what decides whether a case sits flat or overhangs. Ask for a wrist measurement before shipping the 215.30.46.21.03.002, and put the figure in the listing rather than the diameter alone.
These reach different buyers
45.5 mm on the 215.30.46.21.03.002 against 41 mm on the 234.30.41.21.03.002. 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.
A visible difference in how they wear
4.3 mm of thickness separates these, with the 215.30.46.21.03.002 the taller at 18.1 mm. That is the difference between a watch that goes under a cuff and one that catches on it — worth a photograph from the side rather than a number in a table.
Do not describe these the same way
6,000 metres on the 215.30.46.21.03.002 against 300 on the 234.30.41.21.03.002 — 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 215.30.46.21.03.002's rating into the 234.30.41.21.03.002's listing.
What to check on each
215.30.46.21.03.002
- Give the buyer all four case figures in writing before shipping: 45.5 mm across, 18.12 mm tall, 51.9 mm between lug tips and 254 grams. Any one of them alone understates what arrives in the box.
- Describe the case material as O-MEGASTEEL, which is what OMEGA calls it, rather than as stainless steel. It is a named proprietary alloy and the bracelet is specified in it too.
- Inspect the protuberant crystal along its raised edge under raking light. It stands well proud of the case by design, it is coated on both faces, and it meets obstacles before the bezel does.
234.30.41.21.03.002
- Confirm the calibre is the 8912 before quoting anything else. This carries a different movement from the Diver 300M despite the identical depth rating, and their published reserves differ.
- Check the lug width against the published 21 mm. That is an odd size that almost no aftermarket strap maker stocks, and a buyer planning a strap change should hear it from you.
- Measure the fit using the published 48 mm lug to lug rather than the 41 mm diameter, which understates how this case sits.
Sources
- OMEGA official product page for reference 215.30.46.21.03.002 (Seamaster Planet Ocean 6000M Ultra Deep Co-Axial Master Chronometer 45.5 mm) - Between lugs: 22 mm; Lug-to-lug: 51.90 mm; Thickness: 18.12 mm; Case diameter: 45.5 mm; Case: O-MEGASTEEL; Dial color: Blue; Crystal: Domed, protuberant and scratch-resistant sapphire crystal with anti-reflective treatment on both sides; Water resistance: 600 bar (6000 metres / 20000 feet); Total product weight (approx.): 254 g; Caliber: Omega 8912; Movement type: Self winding; Power reserve: 60 hours; Bracelet material: O-MEGASTEEL; Type of Clasp: Foldover clasp with comfort setting and diver extension — retrieved 2026-09-23
- OMEGA official product page for reference 234.30.41.21.03.002 (Seamaster 300 Co-Axial Master Chronometer 41 mm, steel) - Between lugs: 21 mm; Lug-to-lug: 48.00 mm; Thickness: 13.85 mm; Case diameter: 41 mm; Case: Steel; Dial color: Blue; Crystal: Domed, scratch-resistant sapphire crystal with anti-reflective treatment inside; Water resistance: 30 bar (300 metres / 1000 feet); Total product weight (approx.): 156 g; Caliber: Omega 8912; Movement type: Self winding; Power reserve: 60 hours; Bracelet material: Steel; Type of Clasp: Foldover clasp with comfort setting — retrieved 2026-09-23
Not affiliated with OMEGA. Specifications are read from each manufacturer's own published documentation on the dates shown and may change; the manufacturer's current documentation governs.