Omega Speedmaster Professional Moonwatch vs Rolex Datejust 31
Ref. 311.30.42.30.01.005 vs Ref. M278271-0006
Comparing the Omega Speedmaster Professional Moonwatch to the Rolex Datejust 31 means weighing a significant price difference — is the premium justified? At ~$6,000 (market value) versus $14,300, these two watches serve different segments of the market. Here's how they stack up on specifications, value retention, and investment potential.
Price Comparison
Omega
Speedmaster Professional Moonwatch
Rolex
Datejust 31
The Omega Speedmaster Professional Moonwatch is priced at ~$6,000 (market value) while the Rolex Datejust 31 comes in at $14,300. On the secondary market, the gap narrows: the Omega Speedmaster Professional Moonwatch trades around $6,000 and the Rolex Datejust 31 around $13,585, a difference of $7,585 favoring the Omega Speedmaster Professional Moonwatch. Trading at 1% above retail and trending upward, this model holds its value well on the pre-owned market. The Rolex Datejust 31 shows a more modest market premium of -5.0%, holding steady. Both watches score equally on flip potential at 4/10, making neither a clear investment winner over the other.
Specifications
| Specification | Omega Speedmaster Professional Moonwatch | Rolex Datejust 31 |
|---|---|---|
| Case Diameter | 42mm | 31mm |
| Case Thickness | 14.3mm | 11.3mm |
| Case Material | Stainless steel | Oystersteel and 18ct Everose gold |
| Bezel | Stainless steel bezel ring with tachymetre scale | 18ct Everose gold, fluted |
| Crystal | Hesalite crystal front, sapphire caseback | Sapphire with Cyclops lens |
| Water Resistance | 50m / 167ft | 100m / 330ft |
| Movement | Omega calibre 1861 | Rolex calibre 2236 |
| Movement Type | Manual-winding | Automatic |
| Power Reserve | 48 hours | 55 hours |
| Bracelet/Strap | Stainless steel bracelet | Jubilee, five-piece links in Oystersteel and 18ct Everose gold |
| Clasp | Folding clasp | Oysterclasp with Easylink 5mm comfort extension |
| Lug Width | 20mm | 16mm |
Key specification differences stand out between these two: The Rolex Datejust 31 leads in water resistance (100m / 330ft vs. 50m / 167ft), and the Rolex Datejust 31 offers longer power reserve at 55 hours, and the Omega Speedmaster Professional Moonwatch uses Stainless steel while the Rolex Datejust 31 opts for Oystersteel and 18ct Everose gold. With 8 notable spec differences in total, the choice depends on which features matter most to your use case.
Value Per Feature
Per millimeter of case diameter, the Omega Speedmaster Professional Moonwatch costs $143 versus $438 for the Rolex Datejust 31. For water resistance, the Omega Speedmaster Professional Moonwatch delivers better value per meter of depth rating. The Omega Speedmaster Professional Moonwatch offers more power reserve per dollar spent.
Which Should You Buy?
Choose the Omega Speedmaster Professional Moonwatch if you value a lower entry price, better value retention, timing functionality. Go with the Rolex Datejust 31 if you prioritize the Rolex heritage.
Frequently Asked Questions
Which is more affordable, the Omega Speedmaster Professional Moonwatch or the Rolex Datejust 31?
The Omega Speedmaster Professional Moonwatch is more accessible, priced at ~$6,000 (market value) compared to $14,300.
Which holds its value better on the secondary market?
The Omega Speedmaster Professional Moonwatch currently trades at 0.8% above retail, indicating strong value retention on the pre-owned market.
How do the Omega Speedmaster Professional Moonwatch and Rolex Datejust 31 compare in size?
The Omega Speedmaster Professional Moonwatch measures 42mm in diameter and 14.3mm thick, while the Rolex Datejust 31 is 31mm by 11.3mm. Water resistance differs too: 50m / 167ft versus 100m / 330ft.
What movements do these watches use?
The Omega Speedmaster Professional Moonwatch uses the Omega calibre 1861 with 48 hours power reserve, while the Rolex Datejust 31 runs on the Rolex calibre 2236 offering 55 hours of power reserve.
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