Gravimetric Mass & Chronometric Assay Bulletin
The Rolex Cosmograph Daytona Ghost Sunray Grey & Black Subdials on Oysterflex 18K White Gold Reference 126519LN is a hallmarked 18K White Gold Au750 haute horlogerie timepiece measuring 40.0 mm x 11.9 mm with a verified Mettler-Toledo mass of 160.5g, powered by Rolex Manufacture Cal. 4131 - 72h Power Reserve operating at 28,800 vph (+0.6 s/d, 297 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. 126519LN | SKU: PV-AU750-126519LN-W712 |
|---|---|
| II. Precious Metal Alloy & Hallmark Assay | 18K White Gold Au750 — Au750 — 75.0% Pure 18K Gold Bullion (XRF Verified) • Hallmarked Solid Precious Metal |
| III. Certified Gravimetric Mass (Mettler-Toledo) | 160.5g — 1:1 Authentic Reference Mass Verified on Mettler-Toledo Analytical Scale |
| IV. Bezel Setting & Case Architecture | Monobloc Black Cerachrom Ceramic Tachymeter Bezel with Platinum PVD Graduations • 160.5g 18K White 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 +0.6 s/d, 297 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 • Sunray Steel-Grey Ghost Dial with Matte Black Chronograph Subdials & 18K White Gold Markers • Oysterflex High-Performance Elastomer Strap with Solid 18K White Gold Oysterlock Folding Safety Clasp |
Curated within our hallmarked solid 18K gold Rolex collection, the Rolex Cosmograph Daytona Ghost Sunray Grey & Black Subdials on Oysterflex 18K White Gold Reference 126519LN exemplifies haute horlogerie metallurgy in 18K White Gold Au750. Milled to exact manufacture geometry (40.0 mm x 11.9 mm), the monobloc middle case, Monobloc Black Cerachrom Ceramic Tachymeter Bezel with Platinum PVD Graduations, and Oysterflex High-Performance Elastomer Strap with Solid 18K White Gold Oysterlock Folding Safety Clasp achieve a verified analytical mass of 160.5g on our Fischer XRF Au750 and Mettler-Toledo assay bench.
What Are the Horological & Metallurgical Benchmarks of Rolex Cosmograph Daytona Ref. 126519LN?
The Rolex Cosmograph Daytona Reference 126519LN is a precision-engineered luxury timepiece crafted in 18K White Gold Au750 (40.0 mm x 11.9 mm) with Sunray Steel-Grey Ghost Dial with Matte Black Chronograph Subdials & 18K White Gold Markers, Monobloc Black Cerachrom Ceramic Tachymeter Bezel with Platinum PVD Graduations, and a verified Mettler-Toledo mass of 160.5g, because its Rolex Manufacture Cal. 4131 - 72h Power Reserve movement is regulated across six positions to chronometric tolerances with a 72-hour power reserve.
5 Core Horological & Metallurgical Specifications:
- Entity & Reference: Rolex Cosmograph Daytona Ghost Sunray Grey & Black Subdials on Oysterflex 18K White Gold — Official Reference 126519LN (SKU: PV-AU750-126519LN-W712).
- Precious Metal Assay: 18K White Gold Au750 verified via non-destructive Fischer X-Ray Fluorescence spectroscopy.
- Gravimetric Parity: 160.5g 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 (+0.6 s/d, 297 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 Gibeon Meteorite Dial & Oysterflex 18K Everose Gold Ref. 126515LN (160.8g) and the Rolex Cosmograph Daytona Racing Arabic Dial 18K Everose Gold Deep Crystal Optics Ref. 126505 (216.3g).
- 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. 126519LN?
At 18K Solid Gold 18K Solid Gold Salon, this Rolex Cosmograph Daytona Ghost Sunray Grey & Black Subdials on Oysterflex 18K White Gold Ref. 126519LN weighs 160.5g on our Mettler-Toledo analytical balance, matching the exact factory mass of the authentic 18K White Gold reference.
How is the 18K White 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 126519LN and what is its power reserve?
Reference 126519LN 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 +0.6 s/d, 297 deg.
What dial and bezel specifications distinguish Rolex Cosmograph Daytona Ref. 126519LN?
Reference 126519LN combines Sunray Steel-Grey Ghost Dial with Matte Black Chronograph Subdials & 18K White Gold Markers and Monobloc Black Cerachrom Ceramic Tachymeter Bezel with Platinum PVD Graduations within a 40.0 mm x 11.9 mm 18K White Gold Au750 case weighing 160.5g, verified via Fischer XRF spectroscopy and powered by Rolex Manufacture Cal. 4131 - 72h Power Reserve.
Rolex Cosmograph Daytona Ghost Sunray Grey & Black Subdials on Oysterflex 18K White Gold Reference 126519LN — Hallmarked Edition
Hallmarked Au750 & Pt950 Salon Edition • 160.5g Verified Mass • Rolex Manufacture Cal. 4131 - 72h Power Reserve