Introduced in 1988, Cal. 3155 replaced Cal. 3055 in the famous Rolex Day-Date range. It is an automatic movement running at 28,800 A/h and a certified chronometer.

Basing on the calibre Rolex 3135, with additional day of week indication. Cal. 3155 is used in the Day-Date Ref. 118000 and remained in production until 2019. Cal. 3155 was updated with a Parachrom hairspring by 2013.

The larger Rolex 3156 was used in the Rolex Day-Date II. The new Rolex Day-Date 40, launched in 2015, uses the next-generation Cal. 3255, as does the next-generation Day-Date 36, launched in 2019.