Omega Speedmaster Moonwatch vs Seamaster Diver 300M
Omega Moonwatch 310.32.42.50.01.001 vs Omega Diver 300M 210.32.42.20.01.001, compared on the specs each brand publishes.
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The short answer
Omega's two best-known lines: the chronograph against the diver.
- Thickness: the Omega Diver 300M 210.32.42.20.01.001 is 0.38 mm thicker (13.56 mm vs 13.18 mm).
- Lug-to-lug: the Omega Diver 300M 210.32.42.20.01.001 is 2.4 mm longer (49.9 mm vs 47.5 mm).
- Water resistance: the Omega Diver 300M 210.32.42.20.01.001 is 250 m more (300 m vs 50 m).
- Power reserve: the Omega Diver 300M 210.32.42.20.01.001 is 5 hours longer (55 h vs 50 h).
- Price: the Omega Diver 300M 210.32.42.20.01.001 lists for $1,100 less in the US ($6,300 vs $7,400).
Side-by-side specs
| Spec | Omega Moonwatch 310.32.42.50.01.001 | Omega Diver 300M 210.32.42.20.01.001 |
|---|---|---|
| Case diameter | 42 mm | 42 mm |
| Thickness | 13.18 mm | 13.56 mm |
| Lug-to-lug | 47.5 mm | 49.9 mm |
| Lug width | 20 mm | 20 mm |
| Calibre | Omega 3861 | Omega 8800 |
| Movement | Manual-wind | Automatic |
| Power reserve | 50 h | 55 h |
| Water resistance | 50 m | 300 m |
| Crystal | Acrylic | Sapphire |
| Case material | Stainless steel | Stainless steel |
| Ships on | Fabric strap | Rubber strap |
| Weight | 91 g | 109 g |
| US list price | $7,400 (US list) | $6,300 (US list) |
| Dial | Black | Black |
| Certification | METAS Master Chronometer | METAS Master Chronometer |
| Chronograph | Yes | Not stated |
| Status | In production | In production |
| Suits wrists of about our sizing guide | 16.8–18.7 cm | 16.9–18.7 cm |
Specs summarised in our own words from the brand's product pages: 310.32.42.50.01.001 source (checked 3 Nov 2026) 210.32.42.20.01.001 source (checked 3 Nov 2026). "Not published" means the brand page we checked doesn't list it, so we leave it blank rather than guess.
All the differences
- Thickness: the Omega Diver 300M 210.32.42.20.01.001 is 0.38 mm thicker (13.56 mm vs 13.18 mm).
- Lug-to-lug: the Omega Diver 300M 210.32.42.20.01.001 is 2.4 mm longer (49.9 mm vs 47.5 mm).
- Water resistance: the Omega Diver 300M 210.32.42.20.01.001 is 250 m more (300 m vs 50 m).
- Power reserve: the Omega Diver 300M 210.32.42.20.01.001 is 5 hours longer (55 h vs 50 h).
- Price: the Omega Diver 300M 210.32.42.20.01.001 lists for $1,100 less in the US ($6,300 vs $7,400).
- Movement: Omega Moonwatch 310.32.42.50.01.001 has Manual-wind; Omega Diver 300M 210.32.42.20.01.001 has Automatic.
- Calibre: Omega Moonwatch 310.32.42.50.01.001 has Omega 3861; Omega Diver 300M 210.32.42.20.01.001 has Omega 8800.
- Crystal: Omega Moonwatch 310.32.42.50.01.001 has Acrylic; Omega Diver 300M 210.32.42.20.01.001 has Sapphire.
- Features: only the Omega Moonwatch 310.32.42.50.01.001 has a chronograph.
- Features: only the Omega Diver 300M 210.32.42.20.01.001 has a date.
Wrist fit
Lug-to-lug decides overhang more than diameter does. Enter your wrist to see how each one should wear.
- Omega Moonwatch 310.32.42.50.01.001 –
- Omega Diver 300M 210.32.42.20.01.001 –
Same rule of thumb as Watch Finder: case diameter of about 23.5% of your wrist circumference (−2 mm to +2.5 mm), and lug-to-lug no longer than about 29% of it plus 1 mm. A guide, not a rule; flat or round wrists differ.
Strap fit
Both take 20 mm straps, so straps move between them. Size charts: Omega lug width chart · Omega lug width chart.
Which should you buy?
It is the more compact case on paper (42 mm across, 47.5 mm lug-to-lug). Our sizing guide puts it at about 16.8–18.7 cm.
It has the lower US list price, $6,300, a $1,100 difference.
It has the higher water-resistance rating: 300 m vs 50 m.
Prices and where to buy
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More: All Omega Speedmaster references · All Omega Seamaster references.
Questions
Which is bigger, the Omega Moonwatch 310.32.42.50.01.001 or the Omega Diver 300M 210.32.42.20.01.001?
Per the brands, the Omega Moonwatch 310.32.42.50.01.001 is 42 mm across and the Omega Diver 300M 210.32.42.20.01.001 is 42 mm.
Which is cheaper?
The Omega Diver 300M 210.32.42.20.01.001, at a US list price of $6,300 vs $7,400 when we checked.
Which is more water-resistant?
Omega Moonwatch 310.32.42.50.01.001: 50 m. Omega Diver 300M 210.32.42.20.01.001: 300 m.
Have you tested these watches?
No. This comparison uses brand-published specs and our own analysis of them, not hands-on testing.
Watch.co is independent and not affiliated with any brand. We haven't handled these watches for this page: everything here comes from brand-published specs and our own analysis. Brand names are used only to identify products.