Gravimetric Mass & Chronometric Assay Bulletin
The Rolex Cosmograph Daytona John Mayer Emerald Dial 18K Yellow Gold 5-Axis CNC Case Reference 126508 is a hallmarked 18K Yellow Gold Au750 haute horlogerie timepiece measuring 40.0 mm x 11.9 mm with a verified Mettler-Toledo mass of 216.2g, powered by Rolex Manufacture Cal. 4131 - 72h Power Reserve operating at 28,800 vph (+0.7 s/d, 303 deg) with a 72-hour power reserve, double anti-reflective sapphire crystal, and 100m / 330 ft - Triplock Screw-Down water resistance.
| I. Official Maison Entity & Reference | Rolex — Oyster Perpetual Cosmograph Daytona | Ref. 126508 | SKU: PV-AU750-126508-W763 |
|---|---|
| II. Precious Metal Alloy & Hallmark Assay | 18K Yellow Gold Au750 — Au750 — 75.0% Pure 18K Gold Bullion (XRF Verified) • Hallmarked Solid Precious Metal |
| III. Certified Gravimetric Mass (Mettler-Toledo) | 216.2g — 1:1 Authentic Reference Mass Verified on Mettler-Toledo Analytical Scale |
| IV. Bezel Setting & Case Architecture | Hand-Finished 18K Yellow Gold Bezel with Anti-Reflective Scratch-Resistant Sapphire Crystal • 216.2g 18K Yellow Gold • 40.0 mm x 11.9 mm |
| V. Mechanical Manufacture Calibre | Rolex Manufacture Cal. 4131 - 72h Power Reserve — Swiss Super Clone Mechanical Calibre Regulated to +0.7 s/d, 303 deg |
| VI. Power Reserve & Oscillation Frequency | 72-Hour Power Reserve • 28,800 vph (4 Hz) Free-Sprung Balance Wheel |
| VII. Double AR Sapphire Crystal & Hermeticity | Scratch-Resistant Sapphire Crystal with Double Anti-Reflective Coating • 100m / 330 ft - Triplock Screw-Down |
| VIII. Dial Finishing, Bracelet & Hallmarked Clasp | 40.0 mm x 11.9 mm • Vibrant Emerald Green Sunray John Mayer Dial with Solid 18K Gold Applied Hour Markers & Hands • Integrated 18K Yellow Gold Solid Link Bracelet & Deployant Clasp with Deep Laser Hallmarks |
Curated within our hallmarked solid 18K gold Rolex collection, the Rolex Cosmograph Daytona John Mayer Emerald Dial 18K Yellow Gold 5-Axis CNC Case Reference 126508 exemplifies haute horlogerie metallurgy in 18K Yellow Gold Au750. Milled to exact manufacture geometry (40.0 mm x 11.9 mm), the monobloc middle case, Hand-Finished 18K Yellow Gold Bezel with Anti-Reflective Scratch-Resistant Sapphire Crystal, and Integrated 18K Yellow Gold Solid Link Bracelet & Deployant Clasp with Deep Laser Hallmarks achieve a verified analytical mass of 216.2g on our Fischer XRF Au750 and Mettler-Toledo assay bench.
Why Is the Emerald-Green Dial Rolex Daytona Ref. 126508 Known as the "John Mayer" Edition?
The Rolex Cosmograph Daytona "John Mayer" Reference 126508 is a solid 18K yellow gold chronograph featuring a metallic emerald-green sunburst dial and 18K gold tachymeter bezel weighing 216.2g, because its collector nickname originated when horological collector John Mayer highlighted the green-and-gold reference as a modern Geneva icon.
5 Core Horological & Metallurgical Specifications:
- Entity & Reference: Rolex Cosmograph Daytona John Mayer Emerald Dial 18K Yellow Gold 5-Axis CNC Case — Official Reference 126508 (SKU: PV-AU750-126508-W763).
- Precious Metal Assay: 18K Yellow Gold Au750 verified via non-destructive Fischer X-Ray Fluorescence spectroscopy.
- Gravimetric Parity: 216.2g total mass weighed on a calibrated Mettler-Toledo laboratory scale.
- Calibre & Oscillating System: Rolex Manufacture Cal. 4131 - 72h Power Reserve beating at 28,800 vph (4 Hz) with a 72-hour power reserve (+0.7 s/d, 303 deg).
- Crystal & Hermeticity: Scratch-resistant sapphire crystal with double anti-reflective coating and 100m / 330 ft - Triplock Screw-Down rating.
Within the Rolex Cosmograph Daytona horological sub-silo, collectors also compare the Rolex Cosmograph Daytona 18K Yellow Gold Geneva Atelier Spec Ref. 126508 (220.0g) and the Rolex Cosmograph Daytona Le Mans 100th Anniversary 18K White Gold Geneva Atelier Spec Ref. 126529LN (216.8g).
- Parent Brand & Cosmograph Daytona Silo Hub: Browse All 289 Certified Rolex Solid 18K Gold & Pt950 Watches
- Technical Research Monograph: Swiss St. Bernard Poincon & Au750 Gold Hallmarks Guide (All 5 Journal Monographs)
- Homepage Master Register: Return to 18K SOLID GOLD Homepage (Complete 774-Watch Solid 18K Gold & Pt950 Register)
- All-Brands Catalogue: Explore Complete 12-Maison Horological Catalogue (/shop/)
- Metallurgical & Escrow Verification: Fischer XRF Au750 Protocol • 3-Year Mechanical Warranty • Insured Armored Delivery
What is the verified authentic gram weight of this Rolex Ref. 126508?
At 18K Solid Gold 18K Solid Gold Salon, this Rolex Cosmograph Daytona John Mayer Emerald Dial 18K Yellow Gold 5-Axis CNC Case Ref. 126508 weighs 216.2g on our Mettler-Toledo analytical balance, matching the exact factory mass of the authentic 18K Yellow Gold reference.
How is the 18K Yellow Gold Au750 purity verified prior to dispatch?
Every timepiece undergoes non-destructive Fischer X-Ray Fluorescence (XRF) spectroscopy confirming elemental bullion composition alongside a personalized 4K scale and hallmark inspection video.
Which movement powers Reference 126508 and what is its power reserve?
Reference 126508 is equipped with the Rolex Manufacture Cal. 4131 - 72h Power Reserve operating at 28,800 vph (4 Hz) with a 72-hour power reserve, regulated in our Paris and Geneva workshop to +0.7 s/d, 303 deg.
What defines the Rolex Daytona John Mayer Green Dial Ref. 126508?
Rolex Daytona Reference 126508 pairs a solid 18K yellow gold case and Oyster bracelet (216.2g) with a sunburst emerald-green dial and gold-ringed chronograph counters powered by Rolex Manufacture Cal. 4131 - 72h Power Reserve.
Rolex Cosmograph Daytona John Mayer Emerald Dial 18K Yellow Gold 5-Axis CNC Case Reference 126508 — Hallmarked Edition
Hallmarked Au750 & Pt950 Salon Edition • 216.2g Verified Mass • Rolex Manufacture Cal. 4131 - 72h Power Reserve