The Rolex Daytona was powered by Valjoux manual winding movements from its inception in 1963 until the introduction of the reference 16520 in 1988. The all-modernized and larger 40mm case would accommodate a modified Zenith El Primero automatic caliber, internally renamed the Rolex caliber 4030.
Dimension
Fits a wrist size of 7.5 inches or smaller.
