Adding diamond hour markers to a Cosmograph Daytona might sound contradictory for a watch born at the racetrack, but the 126503 with its black diamond dial proves otherwise. The 8 diamond indices replace conventional markers at the non-subdial positions, creating points of sparkle against the dark ground without interfering with the chronograph registers. It is a Daytona that acknowledges its sporting roots while dressing up for occasions that call for something with more wrist presence.
Key Specifications
| Specification | Detail |
|---|---|
| Reference | 126503 |
| Case Size | 40mm |
| Case Material | Oystersteel and 18k Yellow Gold |
| Bezel | Fixed, engraved tachymeter in 18k yellow gold |
| Dial | Bright black with 8 diamond hour markers |
| Crystal | Sapphire |
| Movement | Automatic chronograph |
| Water Resistance | 30m |
| Bracelet | Oyster, Oystersteel and yellow gold |
| Clasp | Oysterlock with Easylink |
| Functions | Hours, minutes, small seconds, chronograph |
The 126503 Up Close: Case, Dial and Bracelet
The black dial surface carries a bright, lacquered finish that serves as a dark canvas for the diamond markers. Each of the 8 stones is set between the subdial positions, spaced to preserve the symmetry of the chronograph layout. Gold-toned subdials at 3, 6, and 9 o’clock complement the yellow gold bezel and bracelet centre links, while the diamonds provide focal points of brilliance that move with the wrist.
The engraved tachymeter bezel in 18k yellow gold frames the dial with precision. The two-tone Oyster bracelet in Rolesor combines the strength of Oystersteel with the lustre of gold in an integrated design. Discover additional gem-set references in the Daytona collection.
Movement Options: Swiss vs Japanese
Choose the chronograph caliber that aligns with your priorities:
- Swiss automatic chronograph — smoother high-beat seconds sweep, extended power reserve, and finishing that follows the caliber 4131 blueprint. For collectors who value the highest mechanical standard.
- Japanese automatic chronograph — Miyota-based movement with reliable chronograph function, proven durability, and easy access to qualified service centres. A practical daily-wear tier.
Both movements provide complete start, stop, and reset chronograph operation.
Shipping, Warranty and Returns
Your order ships in discreet, secure packaging with full tracking provided. Delivery schedules vary by country — our shipping policy has all the specifics. Every watch is backed by our movement warranty. Should you wish to return your purchase, our return and exchange policy details your options step by step.


























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