Rolex 3131

The calibre Rolex 3131 is a self-winding movement with bi-directional winding, 28,800 A/h, 31 jewels, Glucydur balance wheel with Microstella screws and Kif shock protection.

The Rolex 3131 is a new version of the Calibre Rolex 3130 with Parachrom blue-Breguet hairspring. In contrast to the calibre Rolex 3135 it lacks the date mechanism.

It is used in the Milgauss Ref. 116400.

Manufacturer: Rolex Description: Self-winding movement, bi-directional winding Chronometer certificate (COSC) Escapement: Stone lever Yoke winding system Parachrom blue-Breguet hairspring Glucydur balance wheel with Microstella screws for precision adjustment Kif shock protection Antimagnetic, in Faraday cage Functions: Central seconds Hacking seconds Data: 12½ lignes D 28.5 mm, H 5.37 mm 31 jewels 28,800 A/h Power reserve 48h Production period: Since 2007