Marathon GSAR (Government Search & Rescue) Diver's AutomaticvsResco UDT Diver - DLC Titanium
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Measurements
Catalog photos are all shot at the same flattering size. These aren't: every case below shares one millimeter scale.

GSAR (Government Search & Rescue) Diver's Automatic

UDT Diver - DLC Titanium
Diameter
41mm
42mm
Lug-to-Lug
48mm
lowest
49.7mm
Thickness
14mm
13mm
lowest
Water Resistance
300m
300m
MSRP
$2,500
$2,155
lowest
Movement
Sellita SW200-1
Sellita SW200-1
Case
4 specsCrystal & Dial
1 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
The Marathon GSAR (Government Search & Rescue) Diver's Automatic is widely praised as a versatile and well-made tool watch, with reviewers highlighting its legibility, utilitarian build, and comfort. Owners appreciate the tritium gas tubes for exceptional illumination in darkness, a feature noted as superior to some alternatives. The 41mm case size is considered ideal by some, though one owner found it wore tall and bumped on objects. While the watch is generally seen as a solid value for a Swiss-made tool watch, some owners have reported quality control issues requiring warranty service. Overall, owners and reviewers rate the Marathon GSAR (Government Search & Rescue) Diver's Automatic highly for its robust build and constant legibility from tritium.
Owners widely appreciate the Resco UDT Diver - DLC Titanium's strong, customizable cases and unique dial with 0.2-second indices and a trident second hand. One owner notes the DLC coating on titanium may show surface scratches, similar to bare titanium, though the reason is unclear. This owner also finds the watch not great value for money, despite appreciating the veteran-owned company and the UDT's versatility on different straps. On balance, owners value the UDT Diver - DLC Titanium for its robust build and distinctive dial design, despite some reservations about its price-to-movement ratio.
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