3155

About the Rolex 3155

The double quick-set was its advance over the 3055 it replaced, which set the date quickly but not the day. It is 28.5 mm across with 31 jewels, a 48-hour reserve and a beat of 28,800 vph, and later examples carry the blue Parachrom hairspring. Every one is a COSC chronometer, and from 2015 a Superlative Chronometer tested again after casing.

In the library it is the movement of the six-digit Day-Date 36, the 118xxx references: the diamond-set 118388 and 118348 and the fluted 118238 and 118208 are the largest families, in yellow, white and Everose gold and platinum. The 3255 replaced it in the 36 mm case in 2019, four years after it debuted in the Day-Date 40; the 3135-to-3235 piece explains the escapement and reserve the new generation brought.

The 3135 is the same base with a date alone, and the 3156 the version with Paraflex shock absorbers that powered the Day-Date II.