Marathon Arctic OSAR 36mm AutomaticvsSeiko Prospex Sea
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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.

Arctic OSAR 36mm Automatic

Prospex Sea
Diameter
36mm
43.8mm
Lug-to-Lug
43.5mm
lowest
48.7mm
Thickness
13mm
12.8mm
lowest
Water Resistance
300m
highest
200m
Power Reserve
n/a
41h
MSRP
$1,200
$625
lowest
Movement
Sellita SW220-1
Seiko 4R35
Case
6 specsCrystal & Dial
3 specsMovement
3 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners widely praise the Marathon Arctic OSAR 36mm Automatic for its tough, reliable feel and looks, with tritium tubes considered an exotic plus for visibility. The 36mm size is noted as a budget-conscious choice for smaller wrists, fitting well on sub-7-inch wrists, though one owner found the size too small and another is still getting used to it. The watch is described as a purpose-built tool watch, not designed for versatility with suits, but rather for singular focus on usefulness and durability. Overall, owners and reviewers rate the Marathon Arctic OSAR 36mm Automatic highly for its durable tool-watch nature and useful tritium illumination.
The Seiko Prospex Sea is widely praised for its excellent value as a sport watch, with owners highlighting its comfortable wearability and generous lume. Reviewers note its solid build quality and attractive design, with some specifically mentioning the matte black dial as a strong point. One owner reports accuracy around +1 to +2 seconds per day. The 43.8mm case size is considered substantial by some, and one owner found the watch heavy and thick, regretting not choosing a different variant. Overall, owners and reviewers rate the Seiko Prospex Sea highly for its blend of classic design and modern utility at an accessible price point.
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