The Zenith 16520 Movement by CYR (TZ)
The modification more important brought by Rolex on the caliber Zenith is the
lowering of alternations per hour of the pendulum of 28 800 to 36 000 as well as
an oscillation frequency that passes of 5 to 4 Hz. This in order bring
this movement chronograph to the standards of Rolex.
The movement Zenith with its 36 000 alt/h renders impossible for fluid lubrications. The El Primero needs a lubrication to dry to bases bisulfure of molibdène applied by a delicate process of vaporization.
Rolex while introducing a bigger pendulum that oscillates less fast ,permitted the return of a fluid lubrication to the standards of the others gauge and this everywhere in the world.
Lower frequency for the clockmakers of the factory Rolex wants to say less than concerns and especially a revision periodically lengthened about all the 4 years.
The El Primero Zenith spiral flat sees modified itself with spiral Breguet and microstella for the 4030 Rolex, pendulum is based on the same system of that the famous Gyromax Patek.
Here the wheel to modified column she also by Rolex, the gauges without his specific mass Rolex and the detail of a waterproof