The Rolex Zenith Daytona marks the turning point in the Daytona lineage as we know them today. They function as the pioneers for the automatic Daytona line as they were powered by a modified Zenith El-Primero movement. With some alterations, a reduction in frequency and some subtle changes, this evolution resulted in the Rolex Calibre 4030. Both famous and popular within the racing industry, the Zenith Daytona has become a fan favorite for collectors of all walks of life.