This is for a gently used Marathon pilots chronograph. It has been worn 3 times! The Marathon Pilot’s Chronograph is a robust chronograph built to the same standards of water resistance as Marathon’s other dive watches. The Pilot’s Chronograph is designed to be used for use in dives, search and rescue operations, as well as pilots and air crew. The Pilot’s Chronograph is commonly referred to as the Chronograph Search and Rescue (CSAR).The Marathon CSAR is water resistant down to 30 ATM – 300 meters (1000 feet) underwater. Made from 316L surgical grade stainless steel, the CSAR is a purpose built watch that will serve you well and reliably on any adventure you may take. The glass of the CSAR is in fact not glass, but a synthetic sapphire which will resist scratches.THE CSAR IS HANDMADE IN LA CHAUX DE FONDS SWITZERLAND TO GUARANTEE THE HIGHEST LEVEL OF QUALITY AND ACCURACY IN MANUFACTURING. INSIDE THE CSAR IS A SWISS MADE, 25 JEWEL VALJOUX ETA 7750 AUTOMATIC CHRONOGRAPH MOVEMENT. THE CSAR ENSURES YOU TIMEKEEPING THAT IS ACCURATE AND RELIABLE.TO MAKE SURE THAT THE TIME CAN BE CONSTANTLY READ EVEN IN LOW LIGHT SITUATIONS, THE CSAR HAS SELF CONTAINED TRITIUM GAS TUBES PLACE ON EACH HOUR MARKING AS WELL AS ON THE MINUTE AND HOUR HANDS AND MARAGLO PHOTO-LUMINESCENT PAINT FOR THE 12 HOUR BEZEL MARKER AS WELL AS ON THE MINUTE AND HOUR CHRONOGRAPH REGISTER INDEXES.TRITIUM TUBES ARE SELF ILLUMINATING GAS TUBES WHICH CONTAIN AN ISOTOPE OF HYDROGEN, MEANING THEY WILL NOT LOSE BRIGHTNESS OVER TIME LIKE PHOTO-LUMINESCENT PAINT WHICH REQUIRES AN EXTERNAL LIGHT SOURCE TO CREATE A GLOW.