Recorded in our Monte-Carlo solid 18K gold Rolex register, the Rolex Day-Date 40 Diamond-Set Bezel 950 Platinum Reference 228396TBR unites authentic Geneva proportions (40.0 mm x 11.5 mm) with a certified 950 Platinum Pt950 mass of 280.6g. Every detail of the Diamond-Set Bezel with Solid 18K Gold Applied Hour Markers & Hands, Baguette-Cut VVS1 Diamond-Set 950 Platinum Bezel with Double-AR Sapphire Crystal, and hallmarked clasp is verified under our Fischer XRF Au750 and Mettler-Toledo laboratory protocol.

5 Core Horological & Metallurgical Specifications:

• Registered Entity & Ref: Rolex Day-Date 40 Diamond-Set Bezel 950 Platinum — Official Reference 228396TBR (SKU: MC-AU750-228396TBR-W88).
• Precious Metal Alloy: 950 Platinum Pt950 with deep mechanical hallmarking and 5-axis Swiss CNC case finishing.
• Verified Reference Mass: 280.6g confirmed on our Monte-Carlo showroom Mettler-Toledo analytical balance.
• Mechanical Calibre: Rolex Manufacture Cal. 3255 - 70h Power Reserve operating at 28,800 vph (4 Hz) with 72-hour power reserve (+0.7 s/d, 303 deg).
• Sapphire Crystal & QC: Scratch-resistant sapphire crystal with double anti-reflective coating and 100m / 330 ft - Twinlock Screw-Down water resistance.

Within the same Rolex horological silo, collectors also compare the Rolex Day-Date 40 18K Yellow Gold Hand-Chamfered Bevel Spec Ref. 228238 (210.1g) and the Rolex Cosmograph Daytona Tahitian Mother-of-Pearl Dial 18K White Gold Ref. 126509 (216.7g).