Strip a dive watch down to what actually matters underwater and you end up with something very close to the Marathon GSAR. Reference WW194006SS-0018 is the 41mm Swiss automatic dive watch in stainless steel, fitted with a black dial and a steel bracelet, and every element of it is there to help you time a dive and read the result in murky water.

Start with the bezel. It ratchets in one direction through 120 clicks, it is oversized for gloved hands, and its 60-minute scale lets you mark your descent at a glance, with a light-charged MaraGlo pip at the top. Then the dial: tritium gas tubes on every hour marker and on all hands give steady light even at depth, with no need to be charged first. The case is rated to 300 meters, sealed by a screw-down crown that sits between protective guards, and topped with sapphire.

Marathon developed these watches for search and rescue use, so they are built to be worn on the job, not just admired. The SW200-1 automatic movement, with Incabloc shock protection, never needs a battery, and the bracelet provides a secure, all-steel attachment. Out of the water, the 24-hour inner scale and 4:30 date keep it practical on land.

Dive-Ready Details: Marathon WW194006SS-0018

• Reference WW194006SS-0018 (GSAR, 41mm)
• 316L stainless case, brushed finish, around 14mm thick
• 300m / 1000ft water resistance
• Unidirectional 120-click bezel with 60-minute scale and MaraGlo pip
• Screw-down crown with crown guards
• Sapphire crystal; black dial with tritium markers and tritium-lit hands
• Sellita SW200-1 Swiss automatic, 26 jewels, about 41-hour power reserve
• Stainless steel bracelet for 20mm lugs

Set the bezel, check the glow, and go.