Pair a stealth case with a dive strap and you get the most purpose-driven version of Marathon's 41mm Anthracite GSAR. Reference WW194006BK-0030 combines the black ion-plated Government Search and Rescue diver with Marathon's 3-piece rubber strap, making it a Swiss automatic dive watch that is as comfortable in salt water as it is on a night patrol.

Every detail on the GSAR exists because search and rescue divers needed it. The oversized 60-minute bezel turns in one direction only, so an accidental bump can only shorten your remaining dive time, never extend it, and its 120 clicks are easy to work with gloves. A screw-down crown with guards seals the case to 300 meters. Tritium tubes on the hour markers and all hands stay lit on their own, while a MaraGlo pip marks the top of the bezel. Black ion plating on the case and bezel reduces reflection, the trait that makes anthracite SAR models suited to night operations.

The FKM rubber strap kit, made in La Chaux-de-Fonds, Switzerland, is the right call for anyone who swims, paddles or sweats in their watch. It shrugs off water, rinses clean and keeps the whole package comfortable on long days.

Marathon WW194006BK-0030 Technical Details

• Reference WW194006BK-0030, 41mm Anthracite GSAR
• Black ion-plated case and bezel, about 14mm thick and 48mm lug to lug
• Sellita SW200-1 automatic, 26 jewels, Incabloc shock protection, approx. 41-hour power reserve
• 300m (1000ft) water resistance; screw-down crown with guards
• Sapphire crystal
• Tritium gas tubes on markers and hands, MaraGlo bezel pip
• Black dial with date at 4:30 and 24-hour scale
• Black 3-piece FKM rubber strap, 20mm lugs

Built for the deep end, finished for the dark.