The Rolex Zenith Daytona ref. 16520 that you see here today is powered by a calibre 4030 movement, which was developed by the Zenith brand for Rolex and then modified in the Rolex factory to offer 28,800 bph. All Daytona movements are now made entirely in-house, making this ref. 16520 a highly prized collector’s item. This example of the line boasts an all-steel finish, a steel Tachymeter bezel calibrated to 400 units, and a classy white dial topped with a luminous display and chronograph registers. While the Cosmograph Daytona is most commonly advertised as a racing watch, its iconic aesthetic has since made it a widely sought-after timepiece among collectors of all professions.