Seiko Prospex SeavsSinn U2 S (EZM 5)
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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.

Prospex Sea

U2 S (EZM 5)
Diameter
43.8mm
44mm
Lug-to-Lug
48.7mm
n/a
Thickness
12.8mm
lowest
15.5mm
Water Resistance
200m
2000m
highest
Power Reserve
41h
48h
highest
MSRP
$625
lowest
$3,802
Movement
Seiko 4R35
Sellita SW330-2
Case
6 specsCrystal & Dial
5 specsMovement
5 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
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.
The Sinn U2 S (EZM 5) features good, solid lume that remains readable throughout the night, though some owners find its initial brightness less impressive than other dive watches. Reviewers note the watch's excellent legibility due to its high-contrast dial and large hands. Overall, owners and reviewers rate the Sinn U2 S (EZM 5) highly for its robust build and legibility, with lume being a functional, if not class-leading, attribute.
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