Rolex Cosmograph Daytona. Here are the detailed specifications:
Case:
 * Material: 18k yellow gold
 * Diameter: 40 mm
 * Thickness: 12.7 mm
 * Water resistance: 100 meters (330 feet)
Movement:
 * Caliber: 4131
 * Type: Self-winding mechanical chronograph
 * Functions: Hours, minutes, seconds, chronograph, tachymeter
 * Power reserve: Approximately 72 hours
Dial:
 * Color: White
 * Indices: Luminescent hour markers and hands
Bezel:
 * Material: Tachymeter scale
 * Color: Black
Bracelet:
 * Material: Oyster bracelet with folding clasp
 * Color: 18k yellow gold
Other features:
 * Superlative Chronometer certified by COSC
 * Screw-down crown and caseback
 * Pusher buttons for chronograph functions
Additional notes:
 * The Rolex Cosmograph Daytona is a highly sought-after watch and can be difficult to obtain.