A substantial dive watch can feel excellent in a photograph and a little less excellent after eight hours on your wrist. Marathon’s new 41 mm Titanium GSAR goes after that familiar problem without sanding away the watch’s blunt tool-watch personality. Marathon claims a 30 percent weight reduction against the steel version.

The case is grade 5 titanium, with a 48 mm lug-to-lug span and a 13.5 mm thickness. That last number is worth noticing. Titanium can make a watch easier to carry, but it cannot make the case disappear under a tight shirt cuff. Marathon pairs it with a three-piece FKM rubber strap and titanium hardware, while keeping a 300-meter water-resistance rating, a unidirectional timing bezel, and tritium gas tubes for low-light readability. We have not handled the watch, so Marathon’s weight comparison remains a manufacturer claim.

At $2,750, this is not a cheap route into a diver. The appeal is a specific combination of lower weight, familiar GSAR layout, and a movement with enough reserve to survive a quiet weekend off the wrist. Orders are scheduled to open November 17, 2026; the product page currently says “Coming Soon.”

The New Sellita Changes More Than the Case Does

Marathon specifies a Sellita SW200-2 Top Grade. Sellita’s technical sheet gives this revised automatic movement a minimum 60-hour reserve and a typical 65-hour reserve. The practical gain over a short-reserve automatic is simple: take the watch off Friday evening and it has a better chance of still running Monday morning. The document also distinguishes movement grades and lists an Incabloc shock absorber for the Top execution. Those are movement-level details, not proof that every finished watch will meet a particular real-world accuracy figure. For a buyer, the case material will change the daily feel; the movement revision changes the daily fuss.

The decision is whether that combination is worth the premium over a steel GSAR. A buyer should compare fully assembled weights on the same strap and confirm wrist fit, not just admire a 30 percent figure. The new titanium watch is still a fairly thick, purpose-built object.

What You Need to Know

• Price: $2,750 listed by Marathon; ordering opens November 17, 2026.
• Case: 41 mm grade 5 titanium; 13.5 mm thick; 48 mm lug to lug.
• Movement: Sellita SW200-2 Top Grade, with a typical 65-hour reserve in Sellita’s documentation.
• Water resistance: 300 meters, according to Marathon.

Why It’s Cool

It keeps the GSAR’s unapologetic instrument look while removing some of the mass that can make an instrument tiring to wear. The weekend-length reserve is the quieter upgrade. Plus, it genuinely looks awesome.

Sources: Marathon Titanium GSAR product page and Sellita SW200-2 technical documentation.