Gravimetric Mass & Chronometric Assay Bulletin
The Rolex GMT-Master II Guinness / Zombie Grey & Black Cerachrom Reference 126713GRNR is a hallmarked 18K Gold & 904L Oystersteel Rolesor haute horlogerie timepiece measuring 40.0 mm x 11.9 mm with a verified Mettler-Toledo mass of 172.1g, powered by Rolex Manufacture Cal. 3285 - 70h Power Reserve operating at 28,800 vph (+0.8 s/d, 300 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. 126713GRNR | SKU: PV-CUST-126713GRNR-W139 |
|---|---|
| II. Precious Metal Alloy & Hallmark Assay | 18K Gold & 904L Oystersteel Rolesor — 5-Axis Swiss CNC Precision Architecture • 1:1 Authentic Reference Mass • Bespoke Collector Commission |
| III. Certified Gravimetric Mass (Mettler-Toledo) | 172.1g — 1:1 Authentic Reference Mass Verified on Mettler-Toledo Analytical Scale |
| IV. Bezel Setting & Case Architecture | Precision Brushed & Polished 18K Rolesor Bezel with Anti-Reflective Scratch-Resistant Sapphire Crystal • 172.1g 18K Gold Rolesor • 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 +0.8 s/d, 300 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 Sunray Collector Dial with Hand-Finished Luminous Appliques & Hands • Hand-Brushed & Chamfered Integrated Solid Link Bracelet & Deployant Clasp |
Curated within our hallmarked solid 18K gold Rolex collection, the Rolex GMT-Master II Guinness / Zombie Grey & Black Cerachrom Reference 126713GRNR exemplifies haute horlogerie metallurgy in 18K Gold & 904L Oystersteel Rolesor. Milled to exact manufacture geometry (40.0 mm x 11.9 mm), the monobloc middle case, Precision Brushed & Polished 18K Rolesor Bezel with Anti-Reflective Scratch-Resistant Sapphire Crystal, and Hand-Brushed & Chamfered Integrated Solid Link Bracelet & Deployant Clasp achieve a verified analytical mass of 172.1g on our Fischer XRF Au750 and Mettler-Toledo assay bench.
What Are the Horological & Metallurgical Benchmarks of Rolex GMT-Master II Ref. 126713GRNR?
The Rolex GMT-Master II Reference 126713GRNR is a precision-engineered luxury timepiece crafted in 18K Gold & 904L Oystersteel Rolesor (40.0 mm x 11.9 mm) with Hand-Finished Sunray Collector Dial with Hand-Finished Luminous Appliques & Hands, Precision Brushed & Polished 18K Rolesor Bezel with Anti-Reflective Scratch-Resistant Sapphire Crystal, and a verified Mettler-Toledo mass of 172.1g, 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 — Official Reference 126713GRNR (SKU: PV-CUST-126713GRNR-W139).
- Precious Metal Assay: 18K Gold & 904L Oystersteel Rolesor verified via non-destructive Fischer X-Ray Fluorescence spectroscopy.
- Gravimetric Parity: 172.1g 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 (+0.8 s/d, 300 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 Vintage Ref. 6542 (114.1g) and the Rolex GMT-Master Vintage Pepsi Red & Blue Cerachrom Ref. 1675 (113.6g).
- 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. 126713GRNR?
At 18K Solid Gold 18K Solid Gold Salon, this Rolex GMT-Master II Guinness / Zombie Grey & Black Cerachrom Ref. 126713GRNR weighs 172.1g on our Mettler-Toledo analytical balance, matching the exact factory mass of the authentic 18K Gold Rolesor reference.
How is the 18K Gold & 904L Oystersteel Rolesor 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 126713GRNR and what is its power reserve?
Reference 126713GRNR 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 +0.8 s/d, 300 deg.
What dial and bezel specifications distinguish Rolex GMT-Master II Ref. 126713GRNR?
Reference 126713GRNR combines Hand-Finished Sunray Collector Dial with Hand-Finished Luminous Appliques & Hands and Precision Brushed & Polished 18K Rolesor Bezel with Anti-Reflective Scratch-Resistant Sapphire Crystal within a 40.0 mm x 11.9 mm 18K Gold & 904L Oystersteel Rolesor case weighing 172.1g, verified via Fischer XRF spectroscopy and powered by Rolex Manufacture Cal. 3285 - 70h Power Reserve.
Rolex GMT-Master II Guinness / Zombie Grey & Black Cerachrom Reference 126713GRNR — Salon Edition
Bespoke Atelier Salon Edition • 172.1g Verified Mass • Rolex Manufacture Cal. 3285 - 70h Power Reserve