Rolex Daytona: Zenith vs In-House Movement | Inside Watches Bob’s Watches

In this episode of Inside Watches, we’re going to take a closer look at the engines driving the Cosmograph Daytona. Shop pre-owned Rolex: https://www.bobswatches.com/rolex/ NAVIGATE THIS VIDEO 01:04 Zenith Movement: Cal. 4030 01:32 In-House Movement: Cal. 4130 Are you interested in adding a legendary Rolex Cosmograph Daytona to your watch box? Bob’s Watches has the largest selection of pre-owned Daytona watches in stock right now and ready to ship to your door. Click here now to shop the collection: https://www.bobswatches.com/rolex-daytona-1.html You’ve heard of the iconic Rolex Cosmograph Daytona chronograph, with its innovative stopwatch function and Tachymeter bezel. But did you know that the watch has had three generations of movements? The first was the manual-wind movement from the Valjoux series. It remained Rolex’s go-to Daytona engine for decades before it was finally replaced with an automatic movement via cal. 4030. The first Daytona to use this movement was the ref. 16520. Rolex had never made a chronograph movement before, so they initially outsourced the cal. 4030 to Zenith and their popular El Primero movement. However, they modified it to remove the date mechanism and alter its frequency from 36,000 bph to 28,800. In doing so, over 200 components were removed from the original El Primero movement to meet Rolex’s strict standards for performance. Calibre 4030 was the only movement in the brand’s catalog that was not produced entirely by Rolex. Ulti