The Rolex Cosmograph Daytona 126503 in Oystersteel and yellow gold (Yellow Rolesor) and the OMEGA Speedmaster Moonwatch Professional 310.20.42.50.99.001 in stainless steel and 18K Sedna Gold are distinct two-tone chronographs, not interchangeable versions of the same idea. The Daytona is the smaller, automatic racing chronograph with a fully documented specification and a US displayed price. OMEGA’s cited 42 mm Moonwatch has a strong NASA-associated heritage, but its event page does not establish the exact reference’s movement, reserve, water resistance, or price. The right choice depends first on which watch’s identity and verified features matter to you.
Which exact watches are being compared?
“Steel and gold” can describe several watches in each family. This comparison is specifically between the Rolex Cosmograph Daytona 126503 in Oystersteel and yellow gold, which Rolex calls Yellow Rolesor, and the OMEGA Speedmaster Moonwatch Professional 310.20.42.50.99.001 in stainless steel and 18K Sedna Gold.
OMEGA’s press page also identifies a separate full-gold Moonwatch Professional, reference 310.60.42.50.01.001. That is not the two-tone watch discussed here. Rolex’s 126503 product page and OMEGA’s event page for the two-tone reference establish the model identities and their stated sizes.
How do their documented specifications compare?
| Feature | Rolex Cosmograph Daytona 126503, Oystersteel and yellow gold (Yellow Rolesor) | OMEGA Speedmaster Moonwatch Professional 310.20.42.50.99.001, stainless steel and 18K Sedna Gold |
|---|---|---|
| Case diameter | 40 mm, according to Rolex’s US product page. | 42 mm, according to OMEGA’s 2026 event page. |
| Movement | Rolex calibre 4131, self-winding mechanical chronograph. | Not stated for this exact reference on the cited OMEGA event page. |
| Power reserve | Approximately 72 hours, according to Rolex. | Not stated for this exact reference on the cited OMEGA event page. |
| Water resistance | 100 metres, according to Rolex. | Not stated for this exact reference on the cited OMEGA event page. |
| Chronograph identity | Centre chronograph seconds hand, 30-minute counter at 3 o’clock, 12-hour counter at 9 o’clock, and a fixed yellow-gold tachymetric bezel. | The reference is identified as a Moonwatch Professional; the cited event page does not provide a full technical specification for its chronograph. |
| Price evidence | $24,550 USD displayed on Rolex’s US product page when accessed in 2026. Region-specific; prices can change. | Not stated for this exact reference on the cited OMEGA event page. |
The case diameters are directly comparable, but diameter alone does not determine wrist fit: lug-to-lug length, case shape, bracelet articulation, and individual wrist proportions also matter. The available pages do not provide a matching set of those measurements for both exact references.
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What does the Daytona offer?
A compact, racing-led chronograph
At 40 mm, the Daytona is 2 mm smaller in stated diameter than the cited Moonwatch. Rolex positions the Cosmograph Daytona around endurance racing, and the 126503 has a fixed yellow-gold bezel engraved with a tachymetric scale. Rolex says that scale can be used to read average speed over a measured distance from elapsed time, with readings up to 400 units per hour. Those details make its timing display explicitly speed-oriented.
Movement and daily-use specifications
Rolex specifies its self-winding calibre 4131, approximately 72 hours of power reserve, Superlative Chronometer certification, and water resistance to 100 metres for the 126503. The case uses a screw-down Triplock crown and sapphire crystal. The Oyster bracelet is in Yellow Rolesor, with an Oysterlock safety clasp and a 5 mm Easylink extension. These are Rolex’s stated product specifications, not results from an independent comparative test. See Rolex’s US specification and price listing for the 126503.
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What does the two-tone Moonwatch offer?
A 42 mm Moonwatch with Sedna Gold
OMEGA identifies reference 310.20.42.50.99.001 as a 42 mm Speedmaster Moonwatch Professional made in stainless steel and 18K Sedna Gold. Sedna Gold is OMEGA’s named material for this model; it should not be relabeled as Rolex Yellow Rolesor or treated as the same gold execution. The 42 mm figure is the diameter stated in OMEGA’s event coverage, not a complete product specification.
Heritage and the limits of the available specification
OMEGA’s 2024 Moonwatch announcement says the Speedmaster has been officially worn by NASA astronauts since 1965 and describes it as the first watch worn on the Moon. That is OMEGA’s historical framing, and it explains why the Moonwatch identity is central to the choice. It does not establish technical details for every reference in the family. OMEGA’s 2024 Moonwatch announcement describes the standard steel Moonwatch with Co-Axial Master Chronometer calibre 3861, but that is collection context—not proof that the two-tone Sedna Gold reference has the same specification.
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Likewise, OMEGA’s manual for steel reference 310.32.42.50.04.001 lists manual calibre 3861, a 50-hour reserve, and 5 bar / 50 m water resistance. Those figures belong to that different steel reference, not to 310.20.42.50.99.001. The manual identifies its own reference and specifications; it should not be used as a substitute specification sheet for the two-tone watch.
Which one should you choose?
Choose the Daytona if its specific strengths fit your priorities
- You prefer the 40 mm case size to the OMEGA’s stated 42 mm diameter.
- You want the documented automatic calibre 4131, approximately 72-hour reserve, 100-metre water resistance, and Rolex’s specified chronograph layout in one exact-reference specification.
- You value a fixed tachymetric bezel with a stated speed-reading function and the Daytona’s endurance-racing positioning.
- The US displayed price of $24,550 USD is relevant to your purchase planning; it is a regional list-page figure accessed in 2026, not a worldwide price or a secondary-market value.
Choose the two-tone Moonwatch if its identity is the priority
- You want a 42 mm Moonwatch Professional in stainless steel and 18K Sedna Gold.
- The NASA-associated Speedmaster history OMEGA describes matters more to you than the Daytona’s racing identity.
- You are willing to confirm the exact reference’s movement, power reserve, water resistance, current regional price, and availability from OMEGA or an authorized retailer before making a specification- or price-based decision.
Can you compare their prices and performance directly?
Not on the available exact-reference evidence. Rolex’s US page displayed $24,550 USD for the 126503 when accessed in 2026, while the cited OMEGA page gives no price for 310.20.42.50.99.001. There is therefore no supported current like-for-like price gap. The same caution applies to movement, reserve, water resistance, accuracy, and bracelet comparisons: the cited OMEGA event page does not specify those details for this two-tone reference, and figures from another Moonwatch reference cannot safely fill the gap.
Rolex states that only official Rolex jewelers are allowed to sell and maintain Rolex watches. The displayed list price does not establish stock or availability. For the OMEGA model, confirm current price and authorized availability in your region with OMEGA or an authorized retailer; the cited event page is not a retail listing.
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- Mineral crystal;Screw-down crown; Stationary stainless steel bezel; Functional Subdials: 60min, 60sec, 24hr; 200 meter water resistant: Suitable for professional marine activity and surface water sports. Suitable for diving.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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