In the highly romanticized world of military horology, there is a distinct difference between watches that merely look tactical and those that are actually issued to operators in the field. Marathon has long operated firmly in the latter category, building over-engineered, uncompromising tools for Search and Rescue (SAR) professionals and military units.
While the brand’s original Anthracite SAR debuted in 2018—specifically designed to eliminate glare during covert night missions—it became apparent that not all operators share the same wrist size. To answer the call for a more commanding presence, the brand has unleashed the Marathon 46mm Anthracite Jumbo Diver’s Automatic Watch (JDD), a supersized, stealthy beast that takes no prisoners.
A Jumbo Canvas for Tactical Excellence
Make no mistake: the Marathon JDD is not for the faint of heart. Measuring a massive 46mm in diameter and standing a towering 18mm thick, this case is unapologetically substantial. Yet, thanks to the tactical application of a durable, anti-reflective black Ion-Plating (IP) over the 316L stainless steel case, the watch visually shrinks on the wrist, trading bulk for a sleek, covert aesthetic.
Designed in Canada and hand-assembled in La Chaux-de-Fonds, Switzerland, the exterior architecture is pure utility. The unidirectional bezel features a fully hashed 60-minute scale, deeply knurled for easy manipulation even when wearing heavy neoprene dive gloves.
A rugged screw-down crown and a thick sapphire crystal work in tandem to guarantee a highly capable 30 ATM (300 meters / 1000 feet) of water resistance.
Uncompromising Illumination
A true tactical dive watch is useless if it cannot be read in the pitch black of a helicopter bay or the murky depths of the ocean. This is where Marathon’s signature technology shines—literally.
Rather than relying solely on traditional luminescent paint that fades over time, the JDD features self-illuminating tritium gas tubes on all hour markers and the full handset. These tubes provide a constant, unwavering glow for decades without ever needing to be charged by an external light source.
For instantaneous orientation in low-light conditions, the dial features a double tritium marker at the 12 o’clock position, complemented by a MaraGlo™ luminescent pip on the bezel. The deep, matte dial also hosts a highly practical bilingual day and date calendar, as well as a 24-hour inner scale for quick military time reference.
The Engine Room: Swiss Reliability
Underneath the stealthy armor beats the heart of a proven mechanical workhorse. The watch is powered by a specialized Anthracite execution of the Swiss-made Sellita SW220 automatic movement.
Key Movement Specs:
- Caliber: 26-Jewel Sellita SW220
- Shock Protection: Incabloc™ system for premium impact resistance
- Functionality: Bilingual Day & Date with Rapid Correction
- Winding: Automatic with manual winding capability
This movement is renowned in the watchmaking industry for its rugged reliability and ease of serviceability—two vital traits for an instrument designed to be battered in the field.
Ready for Deployment
Priced at £2925, the Marathon 46mm Anthracite Jumbo Diver’s Automatic Watch arrives ready for immediate deployment. It comes standard with a highly comfortable, three-piece rubber strap kit out of the box, complete with matching Anthracite hardware to ensure the stealthy aesthetic is completely uninterrupted.
For the collector with a larger wrist, or the professional operator who demands maximum legibility and indestructible build quality, the JDD is a phenomenal proposition. It is a serious tool watch that doesn’t just talk the talk; it’s built to survive the drop.
