Marathon TSAR (Tritium Search & Rescue) Diver's QuartzvsSeiko Quartz Diver's 150m
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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.

TSAR (Tritium Search & Rescue) Diver's Quartz

Quartz Diver's 150m
Diameter
46mm
42mm
Lug-to-Lug
48mm
45mm
lowest
Thickness
14mm
13mm
lowest
Water Resistance
300m
highest
150m
MSRP
$1,550
n/a
Movement
Swiss High-Torque Quartz
7548A
Case
8 specsCrystal & Dial
3 specsMovement
1 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Marathon TSAR (Tritium Search & Rescue) Diver's Quartz owners widely praise its high quality, extreme legibility, and bright tritium tubes that glow without needing to charge. The simple, functional dial layout and ISO 6425 certification are also noted strengths. One owner reports owning a TSAR for nearly 15 years with no problems and found Marathon's service experience to be great. Some owners mention the 41mm TSAR wears small and has a field watch aesthetic, while others note the crown can dig into the wrist. The tritium tubes in the hands provide excellent brightness in the dark. On balance, owners rate the Marathon TSAR (Tritium Search & Rescue) Diver's Quartz highly for its exceptional tritium lume and robust, legible design.
Owners widely praise the Seiko Quartz Diver's 150m 7548-7000 for its rugged, high-precision quartz "beater" dive watch design and excellent timekeeping from its 7548 movement. Some owners appreciate the weathered appearance, finding it adds character, while others note cosmetic restorations enhance its aesthetic appeal, particularly with a Kanji date wheel. The design itself is praised, with some finding the Pepsi variant particularly desirable and worth searching for. The 42mm case is considered suitable for NATO or Jubilee bracelets. Overall, owners rate the Seiko Quartz Diver's 150m 7548-7000 highly for its robust build and precise quartz performance, representing a culmination of Seiko's quartz watchmaking research.
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