Rolex Cosmograph Daytona（904L Steel）Specification Sheet

Case & Dimensions

• Case Diameter: 40 mm
• Case Material: 904L Oystersteel (polished and satin-brushed finishes)
• Bezel: 904L Oystersteel bezel with tachymetric scale
• Crystal: Scratch‑resistant sapphire crystal
• Crown & Pushers: Screw‑down Triplock triple waterproofness system; screw‑down chronograph pushers
• Water Resistance: 100 metres (330 feet)

Movement

• Calibre: 4130, Manufacture Rolex self‑winding mechanical chronograph movement
• Power Reserve: Approximately 72 hours
• Key Features:
  • Paramagnetic blue Parachrom hairspring
  • Vertical clutch chronograph system (long‑duration timing without affecting accuracy)
• Certification: COSC Superlative Chronometer (‑2/+2 sec/day)

Dial, Bracelet & Functions

• Hands & Indices: 18K white gold, filled with Chromalight luminescent material
• Bracelet: 904L Oystersteel, three‑link Oyster braceletRolex
• Clasp: Oysterlock safety clasp with 5 mm Easylink extension system
• Main Functions:
  • Central chronograph seconds (1/8‑second precision)
  • 30‑minute counter at 3 o’clock
  • 12‑hour counter at 9 o’clock
  • Small seconds at 6 o’clock