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.

Seiko Prospex Sea at true scale

Prospex Sea

Sinn U2 S (EZM 5) at true scale

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 specs
Diameter
43.8mm
44mm
Thickness
12.8mm
15.5mm
Lug-to-Lug
48.7mm
n/a
Finish
n/a
black
Water Resistance
200m
2000m
Caseback
n/a
n/a

Crystal & Dial

5 specs
Crystal Shape
n/a
n/a
AR Coating
Anti-reflective coating on inner surface
Underside
Dial Color
n/a
Black
Indices
n/a
n/a
Lume
LumiBrite on hands, index(es) and bezel
Luminescent

Movement

5 specs
Caliber
Seiko 4R35
Sellita SW330-2
Beat Rate
0 vph
28,800 vph
Power Reserve
41h
48h
Jewels
23
25
Complications
None
GMT, Date

Pricing

1 specs
MSRP
$625
$3,802
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Reviews

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Seiko Prospex Sea

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.

Sinn U2 S (EZM 5)

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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