Side by side

Seestern S450 Ocean StarvsLongines SPIRIT ZULU TIME

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

S450 Ocean Star
SeesternS450 Ocean Star
MSRP $299
SPIRIT ZULU TIME
LonginesSPIRIT ZULU TIME
MSRP $3,550

At a glance

21 of 29 specs differ
Diameter
S450 Ocean Star40mm
SPIRIT ZULU TIME39mm
Power Reserve
S450 Ocean Star41h
SPIRIT ZULU TIME72h
Water Resistance
S450 Ocean Star100m
SPIRIT ZULU TIME100m
MSRP
S450 Ocean Star$299
SPIRIT ZULU TIME$3,550

Full specifications

Case

8 specs
Category
Diver
GMT
Diameter
40mm
39mm
Thickness
12mm
13.5mm
Lug-to-Lug
48mm
46.8mm
Lug Width
20mm
21mm
Material
316L Stainless Steel
Ceramic
Finish
Brushed and polished
Caseback
Solid
Screw-down case back

Crystal & Dial

5 specs
Crystal Shape
Flat
AR Coating
Inner
Both sides
Dial Color
White
Anthracite
Indices
Applied
Applied Arabic numerals
Lume
Tritium
Super-LumiNova

Movement

7 specs
Caliber
TMI NH35A
L844.4
Beat Rate
21,600 vph
25,200 vph
Power Reserve
41h
72h
Jewels
24
0
Hacking
Yes
No
Hand-winding
Yes
No
Complications
GMT, Date
Hours, minutes, seconds and date, 24 hours hand with time zone mechanism

Pricing

1 specs
MSRP
$299
$3,550

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What people say

Owners + reviewers, side by side

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

Seestern S450 Ocean Star

Owners widely praise the Seestern S450 Ocean Star's Yachtmaster-style case and flawless bracelet finishing, with one owner noting the ST2130 movement keeps good time. The bezel action is described as having individual notches but feeling like a friction bezel, while another owner flags the bezel and crown action as smooth with perfect alignment. Lume is a point of contention, with one source describing it as a nice cool blue with ice-white application, while others note it as weak or not matching Prospex standards, despite using BGW-9. The watch is considered a "big boy" ideal for larger wrists (19cm+), potentially too large for 17cm wrists due to its size and non-tapering bracelet. Overall, owners rate the Seestern S450 Ocean Star highly for its build quality and finishing at the price point, despite some reservations about its size and lume intensity.

Longines SPIRIT ZULU TIME

Owners widely praise the Longines Spirit Zulu Time for its excellent fit and finish, visual appeal, and value, with many preferring its thinner titanium case and color-matched date wheel. Reviewers highlight its legibility and comfortable 39mm wearability, while some owners note the bracelet could be weightier and lacks tool-less micro-adjustment. Accuracy figures range from +5 seconds per day to unspecified, and one owner reported condensation risk in hot tubs. On balance, owners and reviewers rate the Longines Spirit Zulu Time highly for its blend of tool-watch utility and segment-leading finishing at its price point.

From video reviewers

The 18k gold capped bezel insert is a notable feature, adding a touch of luxury to the watch. However, the watch's lume is not as bright as some reviewers would like, which is a drawback for those who prioritize good illumination. Reviewers disagree on the watch's functionality, with some considering it a compelling option and others feeling it doesn't quite live up to its design.

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