Phoibos LeviathanvsSeiko Prospex Sea 1965 Heritage Diver's Watch

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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.

Phoibos Leviathan at true scale

Leviathan

Seiko Prospex Sea 1965 Heritage Diver's Watch at true scale

Prospex Sea 1965 Heritage Diver's Watch

Diameter

40mm

40mm

Lug-to-Lug

48mm

46.4mm

lowest

Thickness

13mm

13mm

Water Resistance

200m

300m

highest

Power Reserve

n/a

72h

MSRP

$399

lowest

$1,300

Movement

Seiko NH35

Seiko 6R55

Case

2 specs
Lug-to-Lug
48mm
46.4mm
Water Resistance
200m
300m

Crystal & Dial

4 specs
Crystal Shape
n/a
Curved
AR Coating
Yes
Anti-reflective coating on inner surface
Dial Color
Black
n/a
Lume
Super-LumiNova
LumiBrite on hands, index(es) and bezel

Movement

3 specs
Caliber
Seiko NH35
Seiko 6R55
Power Reserve
0h
72h
Jewels
0
24

Pricing

1 specs
MSRP
$399
$1,300
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Reviews

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

Phoibos Leviathan

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.

From video reviewers

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.

Seiko Prospex Sea 1965 Heritage Diver's Watch

Owners widely praise the Seiko Prospex Sea 1965 Heritage Diver's Watch for its refined engineering, comfortable 40mm case, and improved 300m water resistance. The watch is noted for its better build quality and finishing compared to some alternatives, featuring a mix of polished and brushed surfaces, with specific callouts for the jewel-toned teal dial with a rippling-water pattern. Some owners consider the price fair, while others suggest it is too high. Accuracy figures vary, with some owners reporting their 6R55 movement performs well within +/- 10 seconds per day, while others note theirs runs slow or have concerns about QC for the price. The bracelet, while improved, lacks modern features like quick-release or extensive micro-adjustments. Overall, owners and reviewers rate the Seiko Prospex Sea 1965 Heritage Diver's Watch highly for its refined design and build quality at its price point.

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