Rolex Daytona 16520 powered by a Zenith movement in mint conditions and with an official Rolex warranty card. Zenith Daytonas are quickly becoming as collectible as their Valjoux counterparts. This Daytona belongs to the U series, which was only produced for a short period of time between 1997 and 1998. Scarce models like these are poised to become heavy hitters at auctions in the near future.