Rolex Cosmograph Daytona watch, circa 1990-1999, round 18kt yellow gold case with 18kt yellow gold screw-down Triplock winding crown and screw-down pushbuttons, protective crown guard, polished 18kt yellow gold tachymeter engraved bezel, adjustable 18kt yellow gold Oysterlock bracelet, black dial with index hour markers, triple subdials and three-register chronograph, 31 jewel Caliber 4030 self-winding mechanical Oyster Perpetual chronograph movement, scratch-resistant sapphire crystal, water-resistant to 100 meters.