Commonly known as the Tritium Search and Rescue (TSAR). The TSAR is also known as the GSAR Quartz, as it boasts the same capabilities but with a high-torque quartz movement. 

The Arctic dial TSAR™ combines military toughness with Swiss craftsmanship. Water-resistant to 30 ATM - 300 meters (1000 feet) and made from 316L surgical grade stainless steel, the TSAR™ delivers precise timing through a 3 jewel ETA F06 high torque quartz movement. Under the scratch-resistant sapphire crystal are self-contained Tritium gas tubes on each hour marker to ensure constant visibility, even in low-light situations.

Marathon's Arctic Collection is designed for increased visibility even in extreme environments. These search and rescue, tactical watches are forged to withstand the most severe conditions.