Rolex Daytona Black Floating Dial Ref. 6240The ref. 6240 represents a pivotal moment in the history of Rolex's iconic Daytona. Produced as a test for waterproofing chronographs, the 6240 is notable for its rarityfewer than 2,000 examples were madeand its distinctive design elements. This reference laid the foundation for future Daytona models by introducing screw down pushers for enhanced waterproofing, setting a standard for the line. Unique among hand wound Daytonas, the 6240 has no gold