Gravimetric Mass & Chronometric Assay Bulletin
The Rolex Cosmograph Daytona Diamond-Set Bezel 18K White Gold Reference 126539TBR 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 160.8g, powered by Rolex Manufacture Cal. 4131 - 72h Power Reserve operating at 28,800 vph (+0.6 s/d, 304 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. 126539TBR | SKU: PV-AU750-126539TBR-W692 |
|---|---|
| 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) | 160.8g — 1:1 Authentic Reference Mass Verified on Mettler-Toledo Analytical Scale |
| IV. Bezel Setting & Case Architecture | Off-Catalog 18K White Gold Au750 Bezel Set with 36 Trapeze-Cut Baguette VVS Diamonds (TBR — Taille Baguette Diamants) • 160.8g 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, 304 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 • Diamond-Set Bezel with Solid 18K Gold Applied Hour Markers & Hands • Integrated 18K White Gold Hand-Stitched Alligator / Elastomer Strap & Solid Gold Folding Clasp with Deep Laser Hallmarks |
Curated within our hallmarked solid 18K gold Rolex collection, the Rolex Cosmograph Daytona Diamond-Set Bezel 18K White Gold Reference 126539TBR 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, Off-Catalog 18K White Gold Au750 Bezel Set with 36 Trapeze-Cut Baguette VVS Diamonds (TBR — Taille Baguette Diamants), and Integrated 18K White Gold Hand-Stitched Alligator / Elastomer Strap & Solid Gold Folding Clasp with Deep Laser Hallmarks achieve a verified analytical mass of 160.8g on our Fischer XRF Au750 and Mettler-Toledo assay bench.
What Does the TBR Baguette Diamond Designation Mean on Rolex Ref. 126539TBR?
The Rolex Cosmograph Daytona Reference 126539TBR is an off-catalog high-jewelry timepiece in 18K White Gold Au750 equipped with 36 trapeze-cut baguette VVS diamonds on the bezel (TBR — Taille Baguette Diamants) and a verified mass of 160.8g, because off-catalog TBR allocations replace the standard tachymeter or fluted bezel with hand-matched baguette diamond channels.
5 Core Horological & Metallurgical Specifications:
- Entity & Reference: Rolex Cosmograph Daytona Diamond-Set Bezel 18K White Gold — Official Reference 126539TBR (SKU: PV-AU750-126539TBR-W692).
- Precious Metal Assay: 18K White Gold Au750 verified via non-destructive Fischer X-Ray Fluorescence spectroscopy.
- Gravimetric Parity: 160.8g 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, 304 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 Everose Gold Ref. 126505 (216.8g) and the Rolex Cosmograph Daytona Iridescent Natural Mother-of-Pearl Dial 18K White Gold Ref. 116509 (216.7g).
- 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. 126539TBR?
At 18K Solid Gold 18K Solid Gold Salon, this Rolex Cosmograph Daytona Diamond-Set Bezel 18K White Gold Ref. 126539TBR weighs 160.8g 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 126539TBR and what is its power reserve?
Reference 126539TBR 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, 304 deg.
What does the TBR suffix mean on Rolex Cosmograph Daytona Ref. 126539TBR?
The TBR horological suffix designates Taille Baguette Diamants: 36 precision-cut baguette VVS diamonds channel-set into the 18K White Gold Au750 bezel of this 160.8g off-catalog Rolex Reference 126539TBR.
Rolex Cosmograph Daytona Diamond-Set Bezel 18K White Gold Reference 126539TBR — Hallmarked Edition
Hallmarked Au750 & Pt950 Salon Edition • 160.8g Verified Mass • Rolex Manufacture Cal. 4131 - 72h Power Reserve