🔹 Overview
The RL Cosmograph Daytona 40 mm Ref. M116518LN‑0041 is a premier expression of sporty sophistication and precision engineering. This striking chronograph is encased in solid 18 kt yellow gold and paired with a black Oysterflex elastomer strap, offering an eye-catching blend of luxury and athleticism. The contrasting white dial with black chronograph sub-dials provides a sleek, high-contrast aesthetic ideal for legibility and visual impact. Developed for precision timing and endurance, this Daytona merges iconic style with cutting-edge chronograph technology

💎 Key Specifications
Origin: Switzerland – Oyster Perpetual Cosmograph Daytona collection
Gender: Men’s / Unisex
Case Diameter: 40 mm Oyster case in 18 kt yellow gold
Case Material: 18 kt yellow gold, including screw-down case back and chronograph pushers with Triplock system (water resistance to 100 m / 10 ATM)
Bezel: Fixed black Cerachrom ceramic with engraved tachymetric scale (up to 400 units per hour) in platinum deposit, scratch‑resistant and UV-stable
Dial: White main dial with contrasting black snailed sub-dials (30-minute counter at 3 o’clock, 12-hour counter at 9 o’clock, running seconds at 6 o’clock)
Hour Markers: Polished 18 kt yellow gold indices and hands, Chromalight luminescence for enhanced visibility in low light
Bracelet Type: Oysterflex strap combining metal blades overmoulded with high-performance elastomer, secured by an Oysterlock safety clasp with 5 mm Easylink extension link
Glass: Scratch-resistant sapphire crystal
Water Resistance: Up to 100 meters (10 ATM), sealed with Triplock crown and pushers for full chronograph waterproofness

⏱️ Movement
Type: Perpetual, mechanical, self‑winding chronograph, fully manufactured by RL
Caliber: RL Calibre 4130 — robust in-house chronograph movement featuring simplified architecture and fewer components for improved reliability and efficient winding
Certification: Superlative Chronometer, rated to –2/+2 sec/day after casing
Power Reserve: Approximately 72 hours, ensuring multi-day autonomy
Frequency: 28,800 vph (4 Hz)
Jewels / Hairspring / Shock Absorption: The automatic movement houses high-performance components including a vertical clutch, Parachrom hairspring, Chronergy escapement, and Paraflex shock absorbers for precision and resistance to magnetic fields
Functions: Central hours, minutes, and running seconds hands; chronograph with central sweep‑seconds hand, 30‑minute counter at 3 o’clock, 12‑hour counter at 9 o’clock; tachymetric bezel for measuring average speed up to 400 units/hour

✅ Conclusion
The RL Cosmograph Daytona Ref. M116518LN‑0041 is a dynamic fusion of sports performance and luxury refinement. Its 18 kt yellow gold case and high-contrast white-and-black dial deliver bold elegance, while the Oysterflex strap ensures comfort and durability for an active lifestyle. Powered by RL’s advanced Calibre 4130, this chronograph offers exceptional precision, reliability, and a 72-hour power reserve—making it ready at a glance, anytime. From the racetrack to a formal event, this Daytona is a statement piece and a precision instrument, preserving the legacy of RL’s iconic chronographs