Project X Designs presents their latest Rolex mods, the Stealth Mark III and Stealth Mark IV. Hearkening back to military Rolex Submariner (Mil-Sub) watches, the series updates the most modern Rolex Submariner Date watches with details dedicated to the British Special Boat Service (SBS) of the 50s to 70s – the back of each of watch features an engraving of the SBS frog logo and their “By Strength and Guile” motto. The Mark III watch is in steel with a black ceramic bezel insert, while the Mark IV model is in all black steel. Each watch comes on a khaki green NATO strap. Limited to 28 pieces each, and available only through Project X Designs.