OMEGA · Seamaster Diver 300M and Seamaster Aqua Terra 150M
OMEGA 210.30.42.20.01.001 vs OMEGA 220.10.41.21.01.002
9 published specifications differ between these two, and 6 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 | OMEGA Aqua Terra 150M 41mm, black dial220.10.41.21.01.002 |
|---|---|---|
| Case | Steel, 42 mm | Steel, 41 mm |
| Diameter | 42 mm | 41 mm |
| Thickness | 13.56 mm | 13.4 mm |
| Lug to lug | 49.9 mm | 48 mm |
| Water resistance | 30 bar (300 metres / 1,000 feet) | 15 bar (150 metres / 500 feet) |
| Clasp | Foldover clasp with comfort setting and diver extension | Foldover butterfly clasp with comfort setting |
| Calibre | Calibre OMEGA 8800 | Calibre OMEGA 8900 |
| Power reserve | 55 hours | 60 hours |
| 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. | Resistant to magnetic fields reaching 15,000 gauss. Free sprung-balance with silicon balance spring, two barrels mounted in series, and a time zone function. Rhodium-plated rotor and bridges with Geneva waves. Total product weight approximately 148 g. |
What is identical
Worth knowing as much as the differences: these are the specifications you cannot use to tell the two apart.
- Lug width
- 20 mm
- Crystal
- Domed scratch-resistant sapphire crystal with anti-reflective treatment on both sides
- Dial
- Black
- Bracelet
- Steel
- Movement
- Self-winding movement with Co-Axial escapement, automatic winding in both directions
- Certification
- Master Chronometer, approved by METAS
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.
| 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.
One of these is the harder fit
Lug to lug is 49.9 mm on the 210.30.42.20.01.001 against 48 mm on the 220.10.41.21.01.002 — a 1.9 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 210.30.42.20.01.001, and put the figure in the listing rather than the diameter alone.
Do not describe these the same way
300 metres on the 210.30.42.20.01.001 against 150 on the 220.10.41.21.01.002. 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 210.30.42.20.01.001 runs the Calibre OMEGA 8800 and the 220.10.41.21.01.002 the Calibre OMEGA 8900. 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.
220.10.41.21.01.002
- Test the time zone function properly: the hour hand should jump independently in one-hour steps without disturbing the minutes or seconds. A hand that drags the minute hand with it is a fault, not a quirk.
- Check the anti-reflective coating on both crystal surfaces. OMEGA specifies treatment on both sides, and worn or patchy coating on the inner face cannot be polished away — it needs a new crystal.
- Wind and run it for a full day to confirm the 60-hour reserve behaves. Twin barrels in series should deliver consistent amplitude rather than fading early.
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
- OMEGA official product page for reference 220.10.41.21.01.002 (Seamaster Aqua Terra 150M Co-Axial Master Chronometer 41 mm; steel) - Case: steel; 41 mm; Dial color: black; Crystal: domed scratch-resistant sapphire crystal with anti-reflective treatment on both sides; Water resistance: 15 bar (150 metres / 500 feet); Movement: Calibre OMEGA 8900; 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; two barrels mounted in series; automatic winding in both directions; time zone function; special luxury finish with rhodium-plated rotor and bridges with Geneva waves; Power reserve: 60 hours; listed with a 5-year warranty; Re-read 2026-09-23, the page additionally publishes: Between lugs: 20 mm; Lug-to-lug: 48.00 mm; Thickness: 13.40 mm; Case diameter: 41 mm; Total product weight (approx.): 148 g; Type of Clasp: Foldover butterfly clasp with comfort setting; Bracelet material: Steel — 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.