Day-Date 40 Platinum - Baguette / Ice Blue Quadrant

In Context

At 40 mm it is sized to the current mainstream: 40 mm is the median across every watch measured in this catalogue. At 12 mm it is a tall case, and it will catch on a cuff. The case back is closed, so the movement stays out of sight, and the sapphire crystal will resist everything short of deliberate abuse. 100 m is genuine swimming resistance — more than the shape of this watch suggests it would need.

The movement winds itself from the motion of your wrist. 70 hours of reserve is enough to set it down on Friday evening and find it still running on Monday. At 28,800 vph the seconds hand advances 8 times a second.

228396tbr-0004 is one of 6 executions of the 228396tbr base reference. Underneath they are the same watch; what separates this one is a blue dial and a platinum case. Beyond the time it carries a day-date.

The 3255 is the Day-Date movement since 2015, the first of Rolex's current generation: the Chronergy escapement, a 70-hour reserve and fourteen patents. It powers 353 watches in this library. It launched in the Day-Date 40 and brought the day and date, both quick-set, to a new base with the Chronergy escapement, a lever escapement made of nickel-phosphorus with thinner, more efficient geometry, and an optimised blue Parachrom hairspring. A single barrel with thinner walls gives 70 hours. It is 28.5 mm across with 44 jewels and beats at 28,800 vph, and it introduced the Superlative Chronometer standard of two seconds a day tested after casing. The [3135-to-3235 piece](/blog/rolex-3135-to-3235-what-changed) explains the architecture, which the [3235](/calibers/rolex-3235) shares. In the library it powers 142 [Day-Date 40](/brands/rolex/day-date-40) references, every one of that collection, and 211 [Day-Date 36](/brands/rolex/day-date) references of the seven-digit 128xxx generation that received it in 2019. The [3155](/calibers/rolex-3155) is the 48-hour Day-Date movement it replaced, and the [9002](/calibers/rolex-9002) the Sky-Dweller's movement of the same generation.

352 other watches in the library run the Rolex 3255.

Rolex

Day-Date 40 White Gold - Diamond / MOP - Baguette

228349RBR-0046 · 40 mm

Rolex

Day-Date 36 Yellow Gold - Baguette / White - Roman / President

128398TBR-0026 · 36 mm

Rolex

Day-Date 36 Everose Gold - Baguette / Blue-Green - Baguette / President

128395TBR-0032 · 36 mm

Rolex

Day-Date 36 White Gold - Diamond / Blue Ombré - Roman / President

128349RBR-0047 · 36 mm