Case and bracelet made of 18kt white gold, featuring a bi-directional rotating ring bezel also in 18kt white gold. White dial with blue luminous dot hour markers and minute markers on the outer rim; equipped with luminous hands for night readability. Powered by Rolex Calibre 4161 automatic chronometer movement (based on 4160), boasting 48 jewels, a frequency of 28800 vph (~5.5Hz), approximately 72 hours power reserve and composed of 360 parts. Possesses scratch-resistant sapphire crystal, screw-down crown, solid case back, round shape with size 44mm. Water resistant to 100 meters (approx. 330 feet). Functions include chronograph, hour, minute, second subdials, and a date display.