Rolex Cosmograph Daytona

Case Size:

40 mm diameter

~12.3 mm thickness

Case Material:

Rolesor: Oystersteel (904L) + 18k yellow gold

Steel case with yellow-gold crown and pushers

Bezel:

Fixed tachymeter bezel

18k yellow gold, engraved and black-filled numerals

Crystal:

Scratch-resistant sapphire crystal

No Cyclops (Daytona has no date)

Water Resistance:

100 meters / 330 feet

Movement:

Rolex Calibre 4030

Automatic chronograph movement

Based on Zenith El Primero, heavily modified by Rolex

Frequency:

28,800 vph (4 Hz)

(Reduced from Zenith’s original 36,000 vph)

Power Reserve:

Approximately 54 hours

Balance / Shock Protection:

Traditional Nivarox hairspring

KIF shock protection

(Parachrom and Paraflex did not exist yet)

Functions

Hours, minutes, small seconds (at 6 o’clock)

Chronograph:

Central chronograph seconds

30-minute counter at 3 o’clock

12-hour counter at 9 o’clock

No date

Screw-down chronograph pushers

Dial & Hands

Dial Options (factory):

White (“Panda”)

Champagne

Black

Silver

Black with gold sub-dials (varies by year)

Markers / Hands:

Applied 18k yellow-gold hour markers (on most dials)

Tritium lume on earlier pieces (marked “T SWISS T”)

Luminova on late production (marked “SWISS”)

Bracelet & Clasp

Bracelet:

Oyster bracelet

Steel outer links + 18k yellow-gold center links

Clasp:

Folding Oysterlock clasp

No Easylink (introduced years later)

Certification

COSC-certified chronometer

Pre-“Superlative Chronometer −2/+2” standard

Typical tolerance: −4/+6 sec/day