Presented in 950 platinum, the Day-Date 40 reference 228236-0018 carries a monobloc middle case measuring 40mm, fitted with a screw-down case back and a Twinlock double-waterproofness winding crown rated to 100 metres. The fluted 950 platinum bezel frames a scratch-resistant sapphire crystal with a Cyclops lens positioned over the date aperture. Every element of the Oyster architecture — from the concealed folding Crownclasp to the platinum President bracelet with its semi-circular three-piece links — reflects the material and mechanical standard that defines this reference.
The ice blue dial, produced solely for platinum Day-Date models, carries a Chromalight display with blue luminescence alongside instantaneous day and date indications — the complication that has characterised the Day-Date since its introduction. Dial colour shifts subtly under different lighting conditions, giving the watch a distinctive character that photographs rarely capture in full.
Inside, Caliber 3255 — a perpetual, mechanical, self-winding manufacture movement — delivers a precision rating of -2/+2 seconds per day after casing, certified as a Superlative Chronometer to both COSC and Rolex standards. A paramagnetic blue Parachrom hairspring and Paraflex shock absorbers form the oscillator assembly, supported by a power reserve of approximately 70 hours. This example is unworn and comes complete with its original box and 2023 papers, reference 228236-0018.
