Rolex Yacht‑Master 40 mm Blue Dial — Key Specs (Ref. 16628) Feature Specification (Authentic Rolex) Model Name Rolex Yacht‑Master 40 Reference 16628 Case Diameter 40 mm Case Material 18 k Yellow Gold Bezel Bidirectional Rotating 60‑Minute Graduated Yellow Gold Dial Color Blue Sunburst / Blue Dial Crystal Scratch‑Resistant Sapphire Movement Rolex Calibre 3135 Automatic Power Reserve Approx. 48 hours Functions Hours, Minutes, Seconds, Date at 3 o’clock with Cyclops Lens Bracelet 18 k Yellow Gold Oyster Bracelet Clasp Fold‑Over Oysterlock Safety Clasp Water Resistance 100 m / 330 ft Luminescence Luminous Hands & Hour Markers Style Category Luxury Nautical Sports Watch
