What was the name of Rolex’s chronograph watch introduced in 1963 and associated with motor racing?

Rolex’s chronograph watch introduced in 1963 and associated with motor racing was the Cosmograph Daytona.

The model was originally launched as the Cosmograph, with the Daytona name becoming part of its identity in the 1960s. Its connection with racing was strengthened by Rolex’s association with Daytona International Speedway in Florida and by the career of racing driver and actor Paul Newman.

The Daytona is a wristwatch chronograph, meaning it can measure elapsed time independently of the ordinary time display. Many versions feature a tachymeter scale, which can be used to calculate speed over a measured distance.

The model is sometimes called simply the Daytona, but “Cosmograph Daytona” is Rolex’s formal model name. It should not be confused with Rolex’s non-chronograph sports watches such as the Submariner or Explorer.