Rolex Cosmograph Daytona — m126508-0004 (40 mm)
The Rolex Cosmograph Daytona m126508-0004 is a modern expression of Rolex’s legendary motorsport chronograph — marrying luxury materials with track-ready timing performance. Housed in a 40 mm 18 ct yellow gold Oyster case, this reference pairs a bold gold presence with a highly legible black dial and contrasting gold sub-dial rings, delivering a refined yet athletic look.
The case preserves the Daytona’s functional DNA: a monobloc middle case, screw-down case back and Triplock winding crown for robust water resistance to 100 metres (330 ft), plus a fixed 18 ct yellow-gold bezel engraved with a tachymetric scale for measuring average speeds. The watch sits on a solid-link Oyster bracelet secured by an Oysterlock folding safety clasp with the Easylink 5 mm comfort extension.
At its heart is Rolex’s Calibre 4131, a manufacture, self-winding chronograph movement introduced as the Daytona’s next-generation calibre. The 4131 builds on the proven architecture of its predecessor while integrating Rolex technologies that improve efficiency and reliability — notably the energy-efficient Chronergy escapement and enhanced shock-protection systems — all while maintaining a substantial ≈72-hour power reserve. These engineering refinements reduce component count and boost long-term dependability and chronometric performance.
The black dial is arranged for instant clarity: three chronograph counters, applied 18 ct gold hour markers and hands filled with Chromalight luminous material for long-lasting blue glow in low light, and a central sweep seconds hand for the chronograph. The overall finishing — from the polished case facets to the satin-brushed bracelet links — reinforces the Daytona’s sporty-luxury character.
Key specifications (at a glance)
•Reference: m126508-0004.
•Case: 40 mm, 18 ct yellow gold; monobloc middle case, screw-down back.
•Bezel: Fixed 18 ct yellow gold with engraved tachymetric scale.
•Dial: Black with contrasting gold counter rings; Chromalight luminescence.
•Movement: Calibre 4131, self-winding manufacture chronograph; Chronergy escapement; improved shock protection.
•Power reserve: Approximately 72 hours.
•Bracelet / Clasp: Oyster bracelet with Oysterlock folding safety clasp and Easylink 5 mm comfort extension.
•Water resistance: 100 m / 330 ft.
Every detail of this 1:1 Swiss super clone has been meticulously recreated — from the case finishing, dial patterns, and strap texture to arrangeable serial numbers, fonts, and packaging. It is accompanied by a 2-year International United Luxury warranty, delivering the perfect balance of modern sportiness and timeless sophistication.




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