there’s an incredible and long history behind the Blancpain Fifty Fathoms MiL-sPec. one of its most prominent moments of fame was when it introduced the circular water-tightness indicator, which gives the wearer a signal if liquid leaks into the watch case by changing the disk color at 6 o’clock from white to red. it became so popular, in fact, that the Fifty Fathoms became standard-issue for american combat swimmers. the new Blancpain tribute to Fifty Fathoms MiLsPec features a platinum alloy and solid gold winding rotor along with a Blancpain logo that is visible through the clear sapphire case back. in addition, the balance spring is crafted from silicon, which allows it to be much lighter, more shockresistant and impermeable to magnetic fields.