Rolex Cosmograph Daytona ref. 116523 takes the 40 mm chronograph case in steel and yellow gold, a more formal take on the model. The white dial uses diamond hour markers, which gives the standard Daytona layout a cleaner, dressier look. Its automatic chronograph movement keeps the focus on what the Daytona is built to do. At 12.2 mm thick, it has the balanced profile that defines the line.