The rubber strap is where the GSAR feels most at home. Marathon reference WW194006SS-0030 sets the 41mm stainless steel Government Search and Rescue diver, black dial and all, on a black 3-piece FKM rubber strap made in La Chaux-de-Fonds, the Swiss watchmaking town where Marathon assembles its watches.

A three-piece rubber kit is a smart match for a diver because it is happiest in the water, and this one keeps the 41mm steel case light and secure on the wrist during a swim, a dive or a day on the boat. The watch itself is pure Marathon: a Sellita SW200-1 Swiss automatic movement with Incabloc protection, sapphire over the dial, a screw-down crown with guards, 300 meters of water resistance, and tritium gas tubes on the markers and hands that are rated to glow for around 20 years.

Steel case, black dial and black rubber is the classic tool-diver combination for a reason. It looks right with a wetsuit or a T-shirt, and the 24-hour inner scale and date at 4:30 give you a little extra utility once you are back on dry land.

Marathon GSAR on Rubber: WW194006SS-0030 Specs

• Ref: WW194006SS-0030
• Case: 41mm brushed 316L steel, 48mm lug-to-lug, about 14mm thick
• Movement: Swiss automatic Sellita SW200-1 (26 jewels, ~41 hours)
• Water resistance: 300 meters / 30 ATM
• Crystal: sapphire
• Luminous: tritium tubes on markers and hands; MaraGlo pip
• Bezel: one-way, 60 minutes, 120 clicks, glove-friendly
• Strap: black 3-piece FKM rubber with buckle, 20mm lugs

A diver's diver, dressed for the water.