Here are the key specifications for the authentic Rolex Yacht-Master II 42 mm Oystersteel — Reference 116680-0002 Feature Specification Model Name Rolex Yacht-Master II 44 mm Oystersteel Reference 116680-0002 Case Diameter 44 mm Oyster case Case Material Oystersteel (904L stainless steel) Bezel Bidirectional Ring Command bezel with blue Cerachrom ceramic insert Dial Color White with Chromalight luminescence Crystal Scratch-resistant sapphire with anti-reflective coating Movement Rolex Calibre 4161 automatic, self-winding regatta chronograph Functions Hours, minutes, small seconds, programmable regatta countdown (0–10 min) with mechanical memory and on-the-fly sync Power Reserve ~72 hours Bracelet Oyster bracelet in Oystersteel with polished center links Clasp Oysterlock folding safety clasp with Easylink 5 mm comfort extension Water Resistance 100 m / 330 ft with Triplock triple waterproofness system Certification Superlative Chronometer (COSC Rolex after casing) Style Category Professional sports / regatta timer
