3255

About the Rolex 3255

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 explains the architecture, which the 3235 shares.

In the library it powers 142 Day-Date 40 references, every one of that collection, and 211 Day-Date 36 references of the seven-digit 128xxx generation that received it in 2019.

The 3155 is the 48-hour Day-Date movement it replaced, and the 9002 the Sky-Dweller's movement of the same generation.