🔹 Overview
The RL Cosmograph Daytona Ref. 126503-0003 is an icon of motorsport-inspired watchmaking. Crafted in Rolesor — a blend of Oystersteel and 18 ct yellow gold — this 40 mm chronograph embodies both luxury and performance. With its white lacquered dial, Cerachrom tachymeter bezel, and robust Oyster bracelet, the Daytona continues to be the ultimate companion for speed and precision enthusiasts.

💎 Key Specifications
Reference: 126503-0003
Case: 40 mm Oyster case in Rolesor (Oystersteel & 18 ct yellow gold)
Bezel: Yellow gold Cerachrom bezel with tachymetric scale, scratch-resistant ceramic
Dial: White lacquered dial with Chromalight luminescent hour markers and hands, yellow gold finish
Subdials: 30-minute counter at 3 o’clock, 12-hour counter at 9 o’clock, small seconds at 6 o’clock
Crystal: Scratch-resistant sapphire
Bracelet: Oyster bracelet in Rolesor, three-piece solid links, Oysterlock safety clasp with Easylink 5 mm extension
Water Resistance: 100 m / 330 ft
Movement: RL Calibre 4130, self-winding chronograph
Power Reserve: ~72 hours

⏱️ Movement
Type: Perpetual, mechanical, self-winding chronograph
Caliber: RL Calibre 4130
Features: Central hour, minute, and chronograph seconds hands; 30-minute and 12-hour counters; small seconds; stop-seconds for precise time setting
Certification: Superlative Chronometer (COSC + RL in-house after casing)
Power Reserve: Approximately 72 hours
Construction: Column wheel and vertical clutch for precise chronograph engagement and smooth operation

✅ Conclusion
The RL Cosmograph Daytona 40 mm Ref. 126503-0003 is more than a chronograph — it is a modern legend. Its Rolesor construction offers a refined contrast of steel and gold, while the Calibre 4130 ensures world-class reliability and accuracy. Designed for professional drivers yet admired by collectors, the Daytona remains a symbol of speed, precision, and prestige on and off the racetrack.