Marathon 34mm Black GPM Standard-Issue Field Mechanical Tritium Type II WW194003BK-0101

Commonly known as the General Purpose Mechanical (GPM). It can be wound through the automatic self-winding rotor or by manually winding the crown. Manufactured in accordance with MIL-PRF-46374G, Type II, Class 4.

The Marathon 34mm GPM (General Purpose Mechanical) Standard-Issue Field Watch (WW194003BK-0101) is a compact, no-nonsense timepiece built to true military specifications, prioritizing reliability, legibility, and durability above all else. Featuring a black dial with high-contrast white numerals and inner 24-hour military time track, the layout is designed for quick, intuitive reading in any environment. Tritium gas tubes on the hands and hour markers provide constant illumination without the need for external light, making it exceptionally practical in low-light or field conditions. Housed in a lightweight, fiber shell case, this watch stays true to its purpose as a rugged, easy-to-wear tool.

What sets the GPM apart is its manually wound mechanical movement—a deliberate choice that enhances reliability by removing the need for a battery, aligning with military requirements for serviceability and longevity. At 34mm, it wears true to traditional field watch proportions, offering a subtle, utilitarian presence on the wrist. Paired with a durable strap and built for real-world use, this Marathon isn’t about luxury—it’s about function, heritage, and proven performance. For collectors who appreciate authentic military gear and mechanical simplicity, the GPM delivers exactly what it’s designed to do—nothing more, nothing less.

Reference: WW194003BK-0101

Bracelet: Black Nylon DEFSTAN

Case: 34mm x 12.5mm Thickness x 41mm lug to lug - High-Impact Composite Fibreshell

Submersibility: 3ATM

Lug Width: 16mm

Movement: Seiko NH35A - Automatic

Dial: Black Dial - Tritium Gas Tubes

Functions: HMS

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

Crystal: Sapphire

Bracelet size: 7.5"

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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.