Rolex Calibre 4130 is a mechanical chronograph movement with a column wheel and vertical clutch that replaced the Zenith El Primero movement in the 2000 Cosmograph Daytona model. The Superlative Chronometer is accurate to within 1/8 of a second. 

Rolex 4130 Movement (photo: Rolex)

Equipped with 44 rubies, Rolex over coil, four gold Microstella nuts for high precision regulating and a power reserve of 72 hours, this movement resists shock and magnetism to provide ultimate accuracy. A blue Parachrom hairspring gives it a frequency of 28,800 beats per hour.

The Cosmograph Daytona model features a 30 minute counter at the 3 o'clock position, seconds counter at the 6 o'clock position, a 12 hour counter at the 9 o'clock position and stop seconds to allow for accuracy in time keeping. According to Crown & Caliber, the 4130 movement is one of the most innovative watch movements. It is manufactured completely in house by Rolex.

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