Some buyers want the rugged look and capability of a military diver without the tritium tubes found on many of Marathon's other models. The Marathon 36mm OSAR-D WW194026SS-2004 delivers exactly that: a black-dial Swiss automatic dive watch illuminated entirely by MaraGlo, Marathon's light-charged lume, on a stainless steel bracelet.

MaraGlo works like a battery for light. Expose the dial to the sun or a lamp and the generous geometric indices, hands and bezel pip glow brightly for several hours after dark. On the OSAR-D, those indices are deliberately large, giving a bold and very readable layout that suits the compact 36mm case. A cyclops magnifier enlarges the date at 3 o'clock, a defining detail of the "Original Search and Rescue with Date," which Marathon relaunched in 2024 as an update of the SAR-D once issued to Canadian SAR Techs.

Specification-wise, the OSAR-D gives up nothing to its tritium-equipped siblings. It is rated to 300 meters, sealed by a screw-down crown with guards, protected by a sapphire crystal and powered by a Sellita SW200-1 automatic movement with Incabloc shock protection. Its 13mm-thick case and 43.5mm lug-to-lug length make the black dial and steel bracelet an easy daily combination.

Specifications for WW194026SS-2004

• Marathon 36mm OSAR-D, Type I black dial
• Brushed 316L stainless steel case, 13mm thick, 43.5mm lug to lug
• 18mm lug width, stainless steel bracelet
• Swiss Sellita SW200-1 automatic, 26 jewels, Incabloc shock protection
• 300m / 1000ft water resistance
• Sapphire crystal, cyclops-magnified date at 3:00
• MaraGlo photoluminescent lume on indices, hands and pip
• Unidirectional 120-click bezel, guarded screw-down crown

Charge it with daylight and let it guide you through the evening.