One of the best watch investments anyone can buy under 20k. Not only is this 2004 'F' serial aluminium bezel 16600 Sea-Dweller long discontinued, it is also, quite remarkably, still in "new old stock' condition. Never worn, certainly never polished, this professional diver's watch with helium escape valve is waterproof to 1220m and complete with its Rolex box, punched Rolex certificate, booklets, anchor, Buehlmann dive chart and special micro Rolex screw-driver. A true time capsule, and guaranteed investment.