Take it off on Friday night, pick it up on Monday morning, and it is still ticking. That is the practical magic of the 62-hour power reserve inside the Marathon 46mm OSAR-D WW194037SS-2003, a black-dial Swiss automatic dive watch on a stainless steel bracelet.

Most automatic watches stop after a day and a half off the wrist, which means resetting the time and date every time you rotate to something else for the weekend. The Sellita SW600 b in this OSAR-D stores enough energy to bridge a full weekend, removing one of the small annoyances of owning a mechanical watch. It is also the first SAR model from Marathon to carry the SW600 b, with 24 jewels and Incabloc shock protection to keep the balance safe from impacts.

The rest of the watch is equally sensible. A 1.5x cyclops magnifies the date at 3 o'clock, large geometric indices and broad hands carry MaraGlo lume, and the bezel turns in one direction with 120 positive clicks. The 46mm brushed steel case, 17mm thick, seals with a guarded screw-down crown to 300 meters and is topped with sapphire crystal. It is the Original Search and Rescue with Date, a lineage that runs back to the SAR-D worn by Canadian SAR Techs.

Weekend-Proof Specs: Marathon WW194037SS-2003

• Power reserve: 62 hours (Sellita SW600 b automatic, 24 jewels)
• Shock protection: Incabloc
• Case: 46mm 316L stainless steel, 17mm thick, 55mm lug to lug
• Lugs: 22mm
• Water resistance: 30 ATM
• Crystal: sapphire with 1.5x date cyclops
• Lume: MaraGlo on dial and bezel pip
• Dial and bracelet: black dial, stainless steel bracelet

Less resetting, more wearing.