Brand: Rolex Model: Sea-Dweller Reference: 16600 Movement: Automatic, calibre 3135 Case: Stainless steel Dial: Black Dimensions: 40 mm (vertical) x 40 mm (horizontal) Additional information: (manufactured in 1991) Serial number X, date display, unidirectional rotating bezel, maximum power reserve of approximately 48 hours, discontinued model (approximately 1989 to 2009), tritium, water-resistant to 1,220 m Accessories: Generic box and certificate