A white-dial diver on a slim wrist has a lightness that few watches can match. The Marathon 36mm OSAR-D Arctic Edition, reference WW194026SS-2503, combines that airy look with genuine Search and Rescue toughness, in a Swiss automatic dive watch sized for smaller wrists and fitted with a stainless steel bracelet.

Proportion is the headline. With a 36mm diameter, a 13mm case height and 43.5mm from lug to lug, this OSAR-D sits within the wrist instead of spilling over it, and the 18mm bracelet follows the curve neatly. The white Arctic dial makes the watch read open and approachable, a pleasant contrast to the heavy black divers that dominate the category. It is easy to picture with a summer shirt or a crisp oxford, and equally comfortable at the pool.

Under the friendly face lies the full OSAR-D specification. The Original Search and Rescue with Date traces back to the SAR-D that Canadian SAR Techs wore in the early 2000s, and its modern form features large MaraGlo-filled geometric indices, a cyclops-magnified date at 3 o'clock, sapphire crystal and a guarded screw-down crown. It is rated to 300 meters and powered by a Sellita SW200-1 Swiss automatic movement with Incabloc shock protection.

Proportions and Specs: WW194026SS-2503

• Model: Marathon 36mm OSAR-D Arctic Edition
• Diameter: 36mm; thickness: 13mm; lug to lug: 43.5mm
• Lug width: 18mm, stainless steel bracelet
• Case: brushed 316L stainless steel
• Movement: Sellita SW200-1 automatic, 26 jewels, around 41 hours
• Water resistance: 30 ATM
• Lume: MaraGlo on indices, hands and bezel pip
• Dial: Arctic white, date at 3 with cyclops

Light in look, serious in substance, and sized just right.