Built for the water first and everything else second, the Marathon MSAR Auto WW194026SS-0109 is a 36mm Swiss automatic diver rated to 300 meters. It is the medium-sized member of Marathon's Search and Rescue line, finished here with a matte black dial and a stainless steel bracelet.

Look at how the watch is meant to be used underwater. The unidirectional bezel is oversized and clicks through 120 positions in one direction only, so an accidental bump can only shorten your elapsed-time reading, never extend it. A MaraGlo pip marks the starting point, while tritium tubes on the dial and hands stay legible as daylight fades with depth. The screw-down crown is shielded by guards, the crystal is sapphire, and the Sellita SW200-1 movement inside is protected by Incabloc shock absorbers. Marathon developed this SAR toolkit to Canadian Government requirements for search and rescue operations, which tells you the intended standard of abuse.

The Standard-Issue dial carries no government markings, just the Marathon name, a date at 4:30 and bold, simple indices. On land the 36mm size keeps the watch comfortable under a wetsuit cuff or a dress shirt alike.

Dive-Ready Specs for WW194026SS-0109

• Family: Marathon MSAR Auto (Medium Search and Rescue Automatic)
• Case: 36mm, brushed 316L steel, roughly 14mm thick, 18mm lugs
• Movement: Sellita SW200-1 self-winding, 26 jewels, approx. 41h reserve
• Water resistance: 30 ATM, 300 meters
• Bezel: unidirectional, 60-minute scale, 120 clicks, sized for gloves
• Crown: screw-down with crown guards
• Crystal and lume: sapphire; tritium gas tubes with MaraGlo pip
• Dial and bracelet: matte black NGM dial, stainless steel bracelet

Strap it on, screw down the crown, and go deep.