The MIL-SHIPS-W-2181 sport watch was inspired by a timepiece developed for the U.S. Navy, and it has a unique paper strip on the dial that indicates if moisture has entered the watch, and will change color should the water resistance, up to 200 meters ever start to fail. The top ring will only rotate once it is pressed down. The black matte dial is set into a stainless steel case, and has a black NATO strap made with a finely-woven nylon material made to withstand continuous contact with water.