Gravimetric Mass & Chronometric Assay Bulletin
The Rolex GMT-Master II Guinness / Zombie Grey & Black Cerachrom 18K Everose Gold Reference 126715CHNR is a hallmarked 18K Rose Gold Au750 haute horlogerie timepiece measuring 40.0 mm x 11.9 mm with a verified Mettler-Toledo mass of 225.4g, powered by Rolex Manufacture Cal. 3285 - 70h Power Reserve operating at 28,800 vph (+0.5 s/d, 299 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 GMT-Master II | Ref. 126715CHNR | SKU: PV-AU750-126715CHNR-W606 |
|---|---|
| II. Precious Metal Alloy & Hallmark Assay | 18K Rose Gold Au750 — Au750 — 75.0% Pure 18K Gold Bullion (XRF Verified) • Hallmarked Solid Precious Metal |
| III. Certified Gravimetric Mass (Mettler-Toledo) | 225.4g — 1:1 Authentic Reference Mass Verified on Mettler-Toledo Analytical Scale |
| IV. Bezel Setting & Case Architecture | Bidirectional 24-Hour Brown & Black Root Beer Cerachrom Ceramic Bezel • 225.4g 18K Everose Gold • 40.0 mm x 11.9 mm |
| V. Mechanical Manufacture Calibre | Rolex Manufacture Cal. 3285 - 70h Power Reserve — Swiss Super Clone Mechanical Calibre Regulated to +0.5 s/d, 299 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 • Hand-Finished Collector Dial with Solid 18K Gold Applied Hour Markers & Hands • Integrated 18K Everose Gold Solid Link Bracelet & Deployant Clasp with Deep Laser Hallmarks |
Curated within our hallmarked solid 18K gold Rolex collection, the Rolex GMT-Master II Guinness / Zombie Grey & Black Cerachrom 18K Everose Gold Reference 126715CHNR exemplifies haute horlogerie metallurgy in 18K Rose Gold Au750. Milled to exact manufacture geometry (40.0 mm x 11.9 mm), the monobloc middle case, Bidirectional 24-Hour Brown & Black Root Beer Cerachrom Ceramic Bezel, and Integrated 18K Everose Gold Solid Link Bracelet & Deployant Clasp with Deep Laser Hallmarks achieve a verified analytical mass of 225.4g on our Fischer XRF Au750 and Mettler-Toledo assay bench.
What Are the Horological & Metallurgical Benchmarks of Rolex GMT-Master II Ref. 126715CHNR?
The Rolex GMT-Master II Reference 126715CHNR is a precision-engineered luxury timepiece crafted in 18K Rose Gold Au750 (40.0 mm x 11.9 mm) with Hand-Finished Collector Dial with Solid 18K Gold Applied Hour Markers & Hands, Bidirectional 24-Hour Brown & Black Root Beer Cerachrom Ceramic Bezel, and a verified Mettler-Toledo mass of 225.4g, because its Rolex Manufacture Cal. 3285 - 70h 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 GMT-Master II Guinness / Zombie Grey & Black Cerachrom 18K Everose Gold — Official Reference 126715CHNR (SKU: PV-AU750-126715CHNR-W606).
- Precious Metal Assay: 18K Rose Gold Au750 verified via non-destructive Fischer X-Ray Fluorescence spectroscopy.
- Gravimetric Parity: 225.4g total mass weighed on a calibrated Mettler-Toledo laboratory scale.
- Calibre & Oscillating System: Rolex Manufacture Cal. 3285 - 70h Power Reserve beating at 28,800 vph (4 Hz) with a 72-hour power reserve (+0.5 s/d, 299 deg).
- Crystal & Hermeticity: Scratch-resistant sapphire crystal with double anti-reflective coating and 100m / 330 ft - Triplock Screw-Down rating.
Within the Rolex GMT-Master II horological sub-silo, collectors also compare the Rolex GMT-Master II 18K Everose Gold Deep Crystal Optics Ref. 126715CHNR (225.8g) and the Rolex GMT-Master II Graduated Royal Blue Sunburst Dial 18K White Gold Ref. 126719BLRO (225.1g).
- Parent Brand & GMT-Master II 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. 126715CHNR?
At 18K Solid Gold 18K Solid Gold Salon, this Rolex GMT-Master II Guinness / Zombie Grey & Black Cerachrom 18K Everose Gold Ref. 126715CHNR weighs 225.4g on our Mettler-Toledo analytical balance, matching the exact factory mass of the authentic 18K Everose Gold reference.
How is the 18K Rose 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 126715CHNR and what is its power reserve?
Reference 126715CHNR is equipped with the Rolex Manufacture Cal. 3285 - 70h Power Reserve operating at 28,800 vph (4 Hz) with a 72-hour power reserve, regulated in our Paris and Geneva workshop to +0.5 s/d, 299 deg.
What dial and bezel specifications distinguish Rolex GMT-Master II Ref. 126715CHNR?
Reference 126715CHNR combines Hand-Finished Collector Dial with Solid 18K Gold Applied Hour Markers & Hands and Bidirectional 24-Hour Brown & Black Root Beer Cerachrom Ceramic Bezel within a 40.0 mm x 11.9 mm 18K Rose Gold Au750 case weighing 225.4g, verified via Fischer XRF spectroscopy and powered by Rolex Manufacture Cal. 3285 - 70h Power Reserve.
Rolex GMT-Master II Guinness / Zombie Grey & Black Cerachrom 18K Everose Gold Reference 126715CHNR — Hallmarked Edition
Hallmarked Au750 & Pt950 Salon Edition • 225.4g Verified Mass • Rolex Manufacture Cal. 3285 - 70h Power Reserve