What is the genuine Rolex movement?

Model 3255 movement. Rolex awarded 14 patented technologies to the 3255 movement at the 20 15 Basel World Watch and Jewelry Expo, which set a new standard for the core performance of watch movements. The patented blue Parachrom hairspring produced by Rolex is not affected by magnetic field. Rolex is a famous Swiss watch manufacturer, which was jointly operated by Hans Wissdorf, a German, and Davis, an Englishman, in London on 1905.