OMEGA · Speedmaster Moonwatch Professional and Speedmaster '57
OMEGA 310.30.42.50.01.001 vs OMEGA 332.10.41.51.01.001
9 published specifications differ between these two, and 5 are identical. Every figure below is what the manufacturer states for that reference; nothing is inferred from the other watch.
What differs
| Specification | OMEGA Speedmaster Moonwatch Professional 42mm, Hesalite310.30.42.50.01.001 | OMEGA Speedmaster '57 Co-Axial Master Chronometer Chronograph 40.5mm332.10.41.51.01.001 |
|---|---|---|
| Case | Steel, 42 mm | Steel, 40.5 mm |
| Diameter | 42 mm | 40.5 mm |
| Thickness | 13.54 mm | 12.99 mm |
| Lug to lug | 47.5 mm | 49.64 mm |
| Crystal | Hesalite crystal with OMEGA logo in the centre | Scratch-resistant sapphire crystal with anti-reflective treatment on both sides |
| Calibre | Calibre OMEGA 3861 | OMEGA 9906 |
| Movement | Manual-winding chronograph movement with Co-Axial escapement | Manual-winding |
| Power reserve | 50 hours | 60 hours |
| Movement notes | Resistant to magnetic fields reaching 15,000 gauss. Free-sprung balance with silicon balance spring; rhodium-plated finish with bridges carrying straight Geneva waves. Total product weight approximately 134 g. | Listed by OMEGA as a Master Chronometer certified watch. Total product weight approximately 134 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
- Water resistance
- 5 bar (50 metres / 165 feet)
- Dial
- Black
- Bracelet
- Steel
- Clasp
- Foldover clasp with comfort setting
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 Hz | not stated |
|---|---|---|
| Certification | Master Chronometer, approved by METAS | 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 49.6 mm on the 332.10.41.51.01.001 against 47.5 mm on the 310.30.42.50.01.001 — a 2.1 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 332.10.41.51.01.001, and put the figure in the listing rather than the diameter alone.
Different movements to verify and to service
The 310.30.42.50.01.001 runs the Calibre OMEGA 3861 and the 332.10.41.51.01.001 the OMEGA 9906. 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
310.30.42.50.01.001
- Identify the crystal before anything else. Hesalite is a plastic: it scratches easily, polishes out with a cloth and compound, and carries a small OMEGA logo etched at its centre. A sapphire crystal on this case means you are looking at a different reference number.
- Do not treat scratches on a Hesalite crystal as damage in the way you would on sapphire. They are expected and largely removable, and pricing them as permanent faults misreads the material.
- Check the 3861 is what is fitted. The Moonwatch has used several calibres across its history, and the Master Chronometer 3861 is the current one — papers and caseback should agree.
332.10.41.51.01.001
- Wind it from stopped and pay attention to the feel. This is a manual movement, so your fingers are directly on the barrel and the train, and resistance that is uneven or a stop that arrives early is a real finding.
- Never force the crown past its stop. A manual mainspring has no slipping bridle to protect it, and a previous owner used to automatics may already have tried.
- Note the 60-hour reserve, which is long for a hand-wound chronograph and means a buyer can skip a day without resetting.
Sources
- OMEGA official product page for reference 310.30.42.50.01.001 (Speedmaster Moonwatch Professional Co-Axial Master Chronometer Chronograph 42 mm; steel on steel) - Case: steel; 42 mm; Dial color: black; Crystal: hesalite crystal with OMEGA logo in the centre; Water resistance: 5 bar (50 metres / 165 feet); Movement: Calibre OMEGA 3861; manual-winding chronograph 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; rhodium-plated finish with bridges carrying straight Geneva waves; Power reserve: 50 hours; Frequency: 3 Hz; the watch is listed with a 5-year warranty and as Swiss Made; Re-read 2026-09-23, the page additionally publishes: Between lugs: 20 mm; Lug-to-lug: 47.50 mm; Thickness: 13.54 mm; Case diameter: 42 mm; Total product weight (approx.): 134 g; Type of Clasp: Foldover clasp with comfort setting; Bracelet material: Steel — retrieved 2026-09-23
- OMEGA official product page for reference 332.10.41.51.01.001 (Speedmaster '57 Co-Axial Master Chronometer Chronograph 40.5 mm, steel) - Between lugs: 20 mm; Lug-to-lug: 49.64 mm; Thickness: 12.99 mm; Case diameter: 40.5 mm; Case: Steel; Dial color: Black; Crystal: Scratch-resistant sapphire crystal with anti-reflective treatment on both sides; Water resistance: 5 bar (50 metres / 165 feet); Total product weight (approx.): 134 g; Caliber: OMEGA 9906; Movement type: Manual-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.