Marathon 41mm Pilot's Auto SSNAV-D Standard-Issue Tritium Type II WW194030SS-0103

The Marathon 41mm Pilot's Automatic SSNAV-D Standard-Issue Tritium Type II Ref. WW194030SS-0103 is a rugged, military-inspired timepiece that combines authentic aviation heritage with modern Swiss mechanical watchmaking. Building upon Marathon's original Steel Navigator, developed in partnership with Kelly Air Force Base in 1986, this automatic interpretation delivers the durability and functionality expected from a professional pilot's watch. Housed in a robust 41mm case constructed from 316L stainless steel with a military-grade Parkerized finish, the watch measures just 11mm thick and features a distinctive asymmetrical case design. Its classic black dial incorporates bold white Arabic numerals, a dual 12- and 24-hour military time scale, and a discreet date window positioned at 4:30. Self-illuminating tritium gas tubes on the hands and hour markers provide continuous visibility in low-light environments without requiring an external light source. A scratch-resistant sapphire crystal, screw-down crown, and bidirectional rotating 12-hour GMT bezel complete its purpose-built design.

Powering the Marathon SSNAV-D Standard-Issue is the Swiss-made Sellita SW200-1 automatic movement, featuring 26 jewels, an Incabloc shock protection system, and an approximately 41-hour power reserve. Engineered to withstand demanding conditions, the watch offers 100 meters of water resistance and a 48mm lug-to-lug measurement, providing a comfortable fit while maintaining its rugged military character. The rotating bezel features inset-painted markings and an enhanced grip profile designed for operation while wearing flight gloves, reinforcing its aviation-focused functionality. Paired with a military-specification black nylon DEFSTAN strap, the SSNAV-D maintains the utilitarian aesthetic that has defined Marathon's professional instruments for decades. As the first generation of Steel Navigator watches equipped with an automatic movement, this model represents an important evolution of the collection, combining traditional mechanical craftsmanship with proven military-inspired engineering. With its classic black dial, continuous tritium illumination, and robust Swiss construction, the Marathon SSNAV-D Automatic WW194030SS-0103 is an exceptional choice for collectors seeking an authentic, reliable, and versatile aviation tool watch.

Reference: WW194030SS-0103

Bracelet: Nylon DEFSTAN Strap

Case: 41mm x 11mm Thickness x 48mm lug to lug - Parkerized Stainless Steel

Water Resistance: 100m (10ATM)

Lug Width: 20mm

Movement: Sellita SW200-1 with Incabloc Shock Absorber - Automatic

Dial: Black Dial - Tritium Gas Tubes

Bezel: Bi-Directional (12 Hour)

Functions: HMS, Date

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

Crystal: Sapphire

Bracelet size: 8.2"

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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.