Marathon 41mm Pilot's Quartz NAV-D Standard-Issue Tritium Type II WW194013BK-0101

The Marathon 41mm Pilot’s Quartz NAV-D Standard-Issue Tritium Type II (ref. WW194013BK-0101) is a purpose-built military navigation watch developed from the original Navigator platform created in partnership with Kelly Air Force Base in 1986. Designed for pilots, parachutists, and military personnel operating in extreme conditions, the NAV-D focuses on absolute legibility, lightweight durability, and quartz reliability over luxury finishing or unnecessary complexity. The modern 41mm version features Marathon’s lightweight CeraShell® composite case construction, sapphire crystal, bi-directional 12-hour bezel, and a highly functional Type II dial layout with a red-tipped seconds hand and date complication at 4:30.

Powered by the Swiss ETA F06.115 HeavyDrive quartz movement, the NAV-D delivers exceptional accuracy while remaining highly resistant to shock, vibration, and altitude changes. The watch includes Marathon’s signature self-illuminating tritium gas tubes on the hands, hour markers, and bezel pip, ensuring constant visibility in complete darkness without requiring external charging. With 60 meters of water resistance, screw-down crown protection, and an ultra-light tactical profile, the NAV-D is engineered more like issued equipment than a traditional collector watch.

Reference: WW194013BK-0101

Bracelet: Nylon Strap

Case: 41mm x 11.5mm Thickness x 48mm lug to lug - CeraShell Parkerized

Water Resistance: 60m (6ATM)

Lug Width: 20mm

Movement: ETA F06.115 HeavyDrive-PreciDrive Quartz

Dial: Black Dial - Tritium Gas Tubes

Bezel: Bi-Directional (12 Hour) - Aluminum Bezel

Functions: HMS, Date

Box and Papers: Inner/outer boxes, and warranty card

Crystal: Sapphire

Bracelet size: 7.75"

New

Marathon Watch Company has built a reputation as one of the most trusted military watch brands in the world. Founded in 1939, Marathon specializes in Swiss-made tool watches designed specifically for government and military use.

Unlike many luxury watch brands, Marathon focuses on function over flash. The brand has supplied U.S. and Allied forces with durable, high-performance timepieces for decades. Their watches are known for tritium gas tube illumination, allowing constant visibility in low-light conditions—no charging required.

Popular models like the Marathon GSAR (Government Search and Rescue) and TSAR (Tritium Search and Rescue) are built to withstand extreme environments, making them a go-to choice for divers, pilots, and professionals.

Today, Marathon continues to produce military-issued watches, combining Swiss craftsmanship, rugged durability, and tactical design. If you're searching for a reliable tool watch with real military heritage, Marathon stands in a class of its own.