The Rolex 16600 Sea-Dweller was manufactured for a long period from the late 1980s to around 2009. ? A model can be found thanks to an incredibly successful production run. 16600 in excellent aftermarket condition. The example you see here today is in excellent condition for a watch of its age with little crystal wear. The range of functions includes the caliber 3035 Perpetual, a 40 mm case with a waterproof screw-down crown and a helium safety valve replica watch, a unidirectional time bezel with a 60-minute diving scale and an elastic stainless steel finish. The valve and screw-down crown allow the Sea-Dweller to withstand up to 4,000 feet, making it popular with professional divers and amateurs alike.