Trying to decide between Marathon's GSAR and the OSAR-D? Reference WW194006SS-2003, the 41mm OSAR-D with a black Type I dial on a stainless steel bracelet, is the choice for buyers who want the same Swiss automatic and SAR toughness in a slightly slimmer, more retro-flavored package.

Both watches share 41mm brushed 316L steel cases, 48mm lug-to-lug, 20mm lugs, 300-meter water resistance, screw-down crowns with guards and the Sellita SW200-1 automatic. The differences are in character. The OSAR-D is 13.5mm thick, its date moves to 3 o'clock under a 1.5x cyclops, and its dial uses large geometric indices lit with MaraGlo photoluminescent lume instead of tritium tubes. The look traces back to the SAR-D issued to Canadian SAR Techs in the early 2000s, re-engineered by Marathon for its 2024 relaunch.

The result is a dive watch with a bolder, more graphic dial and an easy-to-read magnified date, while the 120-click unidirectional bezel and sapphire crystal keep it fully capable underwater. If you like your tool watches with a bit of early-2000s military history, this is your Marathon.

OSAR-D WW194006SS-2003 Technical Overview

• Ref.: WW194006SS-2003, 41mm OSAR-D Type I
• 316L stainless steel case: 41mm x 13.5mm, 48mm lug to lug
• Sellita SW200-1 Swiss automatic with Incabloc, 26 jewels
• 300m water resistance
• Sapphire crystal with cyclops date at 3
• MaraGlo lume on geometric indices, hands and bezel pip
• Screw-down crown with guards; 60-minute unidirectional bezel
• Stainless steel bracelet, 20mm lug width

Same SAR backbone, different personality.