Two-part 41 mm white gold case (measured 10 to 4 o'clock) 6.9 mm thick, with contrasting polished and satin finishing on case and bezel, a screw-down crown, and a sapphire crystal case back. Sunburst blue dial with the Nautilus horizontally embossed pattern, baguette-cut diamond hour markers (0.39 ct), and white gold rounded baton-style hour and minute hands with white luminescent coating. Ultra-thin self-winding caliber 240, 27.5 mm in diameter and 2.53 mm thick, with 152 parts and 27 jewels, a 22K gold off-center minirotor engraved “50 1976 – 2026”, Gyromax balance, Spiromax balance spring, and a frequency of 21,600 semi-oscillations per hour (3 Hz). Functions: hours and minutes. Power reserve of min. 48 hours. Navy blue composite-material strap with a fabric pattern and a white gold fold-over clasp. Water-resistant to 30 metres / 100 feet. Patek Philippe Seal certified. Limited edition of 1,000 pieces.