OMEGA · Constellation and Seamaster Aqua Terra 150M
OMEGA 131.30.41.21.04.001 vs OMEGA 220.10.41.21.01.002
7 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 Constellation Co-Axial Master Chronometer 41mm, white dial131.30.41.21.04.001 | OMEGA Aqua Terra 150M 41mm, black dial220.10.41.21.01.002 |
|---|---|---|
| Thickness | 13.5 mm | 13.4 mm |
| Lug to lug | 44 mm | 48 mm |
| Water resistance | 5 bar (50 metres / 165 feet) | 15 bar (150 metres / 500 feet) |
| Dial | White | Black |
| Calibre | Omega 8900 | Calibre OMEGA 8900 |
| Movement | Self winding | Self-winding movement with Co-Axial escapement, automatic winding in both directions |
| Movement notes | Listed by OMEGA as a Master Chronometer certified watch. Total product weight approximately 171 g. No distance between the lugs is published on this product page. | 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.
- Case
- Steel, 41 mm
- Diameter
- 41 mm
- Crystal
- Domed scratch-resistant sapphire crystal with anti-reflective treatment on both sides
- Bracelet
- Steel
- Clasp
- Foldover butterfly clasp with comfort setting
- Power reserve
- 60 hours
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.
| Lug width | not stated | 20 mm |
|---|---|---|
| Certification | not stated | Master Chronometer, approved by METAS |
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 48 mm on the 220.10.41.21.01.002 against 44 mm on the 131.30.41.21.04.001 — a 4 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 220.10.41.21.01.002, and put the figure in the listing rather than the diameter alone.
Do not describe these the same way
The 131.30.41.21.04.001 is rated to 50 metres and the 220.10.41.21.01.002 to 150. A rating is a factory figure for a new watch with fresh gaskets, not a promise about a used one — but the gap still matters in writing. Describe the 131.30.41.21.04.001 in words a buyer can act on, and do not let a template carry the 220.10.41.21.01.002's language onto it.
Different movements to verify and to service
The 131.30.41.21.04.001 runs the Omega 8900 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
131.30.41.21.04.001
- Lead with the 44 mm lug to lug. On a 41 mm case that is an overhang of three millimetres in total, which makes this wear far smaller than its diameter implies.
- Measure the lug width yourself if a buyer asks. OMEGA publishes no between-lugs figure for this reference, and the integrated case makes it a question worth answering precisely.
- Check the white dial under several light sources before describing its colour, since white photographs warm or cool depending entirely on the lighting.
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 131.30.41.21.04.001 (Constellation Co-Axial Master Chronometer 41 mm, steel) - Lug-to-lug: 44.00 mm; Thickness: 13.50 mm; Case diameter: 41 mm; Case: Steel; Dial color: White; Crystal: Domed scratch-resistant sapphire crystal with anti-reflective treatment on both sides; Water resistance: 5 bar (50 metres / 165 feet); Total product weight (approx.): 171 g; Caliber: Omega 8900; Movement type: Self winding; Power reserve: 60 hours; Bracelet material: Steel; Type of Clasp: Foldover butterfly clasp with comfort setting; Between lugs: not published on this page — 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.