Eoniq GMT DivervsSeiko 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.

Eoniq GMT Diver at true scale

GMT Diver

Seiko Prospex Sea at true scale

Prospex Sea

Diameter

41.5mm

43.8mm

Lug-to-Lug

47.5mm

lowest

48.7mm

Thickness

n/a

12.8mm

Water Resistance

200m

200m

Power Reserve

41h

41h

MSRP

$390

lowest

$625

Movement

Seiko NH34

Seiko 4R35

Case

3 specs
Diameter
41.5mm
43.8mm
Thickness
n/a
12.8mm
Lug-to-Lug
47.5mm
48.7mm

Crystal & Dial

2 specs
AR Coating
n/a
Anti-reflective coating on inner surface
Lume
None
LumiBrite on hands, index(es) and bezel

Movement

2 specs
Caliber
Seiko NH34
Seiko 4R35
Jewels
0
23

Pricing

1 specs
MSRP
$390
$625
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Reviews

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

Eoniq GMT Diver

Owners widely appreciate the Eoniq GMT Diver's design and manufacturing details, with one owner reporting flawless operation for over three months. The GMT hand adjusts from the middle crown position, and other owners confirm the GMT function works correctly. Some owners expressed a preference for Roman or Eastern Arabic numerals and a GMT system similar to Grand Seiko's. Alignment issues are noted as more apparent in macro shots than in person, with the brand suggesting it can be addressed. Overall, owners rate the Eoniq GMT Diver highly for its functional GMT complication and solid build at the price.

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.