Seagull Ocean Series Pro 300m Waterproof Diving Watch 44mmvsSeiko 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.

Ocean Series Pro 300m Waterproof Diving Watch 44mm

Prospex Sea
Diameter
44mm
43.8mm
Lug-to-Lug
51mm
48.7mm
lowest
Thickness
13.5mm
12.8mm
lowest
Water Resistance
300m
highest
200m
Power Reserve
n/a
41h
MSRP
$499
lowest
$625
Movement
Seagull ST2130
Seiko 4R35
Case
4 specsCrystal & Dial
2 specsMovement
3 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
Owners praise the quick-release spring bars on the Seagull Ocean Series Pro 300m Waterproof Diving Watch 44mm for simplifying strap changes. The 44mm case is noted as large, though one owner found it fit their wrist well, and the 60-click unidirectional bezel is a familiar feature. Fit, finish, and general quality are considered comparable to a Movado Series 800. On balance, owners rate the Seagull Ocean Series Pro 300m Waterproof Diving Watch 44mm positively for its thoughtful features and build quality at its price point.
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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