Phoibos LeviathanvsSeiko Prospex Sea Save the Ocean Special Edition
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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.

Leviathan

Prospex Sea Save the Ocean Special Edition
Diameter
40mm
43.8mm
Lug-to-Lug
48mm
lowest
48.7mm
Thickness
13mm
12.8mm
lowest
Water Resistance
200m
200m
Power Reserve
n/a
41h
MSRP
$399
lowest
$650
Movement
Seiko NH35
Seiko 4R35
Case
4 specsCrystal & Dial
3 specsMovement
3 specsPricing
1 specsReviews
Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.
The Phoibos Leviathan is widely praised for its superb case finishing, generous lume, and original design elements, offering excellent value. Owners consistently highlight the quality of the bracelet, including its milled clasp with quick adjustments and on-the-fly microadjustment on newer models, and the visually striking, legible dials. Some owners find the watch heavy and large, with one suggesting a smaller 37mm or 38mm case size would be ideal, and others note the stock rubber strap can be thick and sticky. Accuracy varies, with some reporting it keeps accurate time out of the box, while others note a loss of 5-10 seconds per day without a winder. The bezel's jimping is also flagged as potentially causing fingers to slip. On balance, owners rate the Phoibos Leviathan highly for its robust build, excellent finishing, and desirable features at an accessible price point.
The case finishing and bezel action are praised. The bracelet, particularly the clasp, is identified as an area for improvement. Reviewers are split on the watch's wrist presence, with some noting its improved 40mm size and others describing it as having a "beast"-like presence.
The Seiko Prospex Sea Save the Ocean Special Edition is widely praised for its exceptional and beautiful dial designs, featuring wave patterns, gradient blues, and marine animal motifs that evoke the ocean, with many considering them among the best in their price range. Owners also note satisfactory lume, smooth bezel operation, and comfortable wearability, with some finding the 43.8mm case size and 13mm thickness to be well-balanced for daily wear. However, multiple sources criticize the bracelet clasp as flimsy, rattly, or underwhelming, and one owner reported returning the watch due to this. Some owners also note imperfect day/date wheel alignment as a common issue in this price segment. On balance, owners and reviewers rate the Seiko Prospex Sea Save the Ocean Special Edition highly for its stunning dial artistry and overall value.
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