Not every wrist wants a 41mm dive watch, and the Marathon MSAR WW194027SS-0130 is proof you don't have to size up to get a serious one. This 36mm Medium Search and Rescue quartz diver, with a matte black Standard-Issue dial on a black 3-piece rubber strap, keeps the full 300-meter capability of Marathon's larger SAR models in a trimmer, lighter package.

The MSAR is essentially the TSAR's features scaled down. You still get tritium gas tubes on the hour markers and hands that glow continuously without charging, MaraGlo on the bezel pip and seconds hand, a guarded screw-down crown, sapphire crystal and an oversized unidirectional bezel. You still get Swiss ETA F06.115 HeavyDrive quartz with an end-of-life battery indicator. What changes is the footprint: 36mm across, 12.5mm thick and 18mm between the lugs, dimensions that sit neatly on slimmer wrists and slip easily under a cuff.

The rubber strap makes this the most casual, comfortable MSAR. It is a 3-piece FKM rubber kit made in La Chaux-de-Fonds, light enough for all-day wear and built to handle swimming, sweat and sun. The Standard-Issue dial carries no government markings, keeping the small dial as clean and legible as possible.

MSAR WW194027SS-0130 Key Specifications

• Model: Marathon 36mm Medium Diver's Quartz (MSAR)
• Movement: Swiss ETA F06.115 HeavyDrive quartz, end-of-life indicator
• Case: 316L stainless steel, 36mm, 12.5mm thick
• Water resistance: 30 ATM / 300 meters
• Crystal: sapphire
• Dial: matte black Standard-Issue, date at 4:30
• Lume: tritium on markers and hands; MaraGlo pip and seconds
• Strap: black 3-piece FKM rubber, 18mm lugs

Proof that a serious diver can come in a smaller size.