This is a pre-owned Rolex automatic chronograph watch model 16518. Features include an 18kt yellow gold case with yellow gold-tone accents, black dial face featuring hour and minute markers (index type), luminous hands and markers coated in yellow gold-tone material, scratch-resistant sapphire crystal glass, screw-down crown for secure sealing, solid case back, round case shape measuring 40 mm in diameter. Equipped with the Calibre 4030 movement derived from Zenith El Primero 11 base, containing 31 jewels; operates at a frequency of approximately 28,800 vph (4 Hz); offers around 54 hours power reserve when fully wound. Includes three sub-dials displaying chronograph seconds, minutes, and the elapsed hour indicator. Water resistant up to 100 meters / 330 feet.