The Marathon Pilot's Chronograph is a watch designed to be used for dives, search and rescue operations, as well as flights. 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  multi purpose watch that will serve you well and will always be reliable. The glass of the CSAR is in fact not glass, but a synthetic sapphire which is scratch resistant.
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.
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. MaraGlo photo-luminescent paint is used 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.
The dial of the Marathon Pilot's Chronograph shows 12 hour and 24 hour time, Date and Day. Chronograph timing is dual graduated, inner graduations are 1/5 sec and as well as decimal 1/100 minute timing (alternate inner timing ring). A sweep central seconds hand indicates 1/5 sec up to 60 seconds; Chronograph sub registers measure up to 30 minutes and 12 hours each. Register indexes & hands use MaraGlo™paint for low light viewing. Encapsulated tritium (Isotope H3) light sources are used for dial at each hour position as well as the Minute and Hour hands, activity between 28-30 millicuries (under 30 millicuries).