Pre-owned Rolex Daytona 16520. This amazing Rolex watch sports a black dial. This reference better known as the Zenith Daytona: it takes its nickname from the fact that it’s powered by a Zenith El Primero calibre. It wasn’t that long ago that Rolex still relied on 3rd-party suppliers for certain things. Particularly movements, which it then modified in-house. In fact, extensive modifications were undertaken to align the new movement with Rolex’s requirements. Estimates put it at around 200 changes in total. With the resulting movement retaining a mere 50% of the Zenith caliber 400’s parts. These changes focused on increasing reliability and minimizing the need for maintenance. Brand: Rolex Model: Daytona Reference: 16520 Case Material: Steel Movement: Automatic Dimension: 40 Mm Dial: Black Bezel: Steel Crystal: Sapphire Bracelet Type: Oyster Bracelet Material: Steel Original Box: No Original Papers: No Year: approx. the '90s Condition: Very Good