Side by side

Seestern S450 Ocean StarvsSpinnaker Bradner GMT

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

S450 Ocean Star
SeesternS450 Ocean Star
MSRP $299
Bradner GMT
SpinnakerBradner GMT
MSRP $299

At a glance

13 of 29 specs differ
Diameter
S450 Ocean Star40mm
Bradner GMT42mm
Power Reserve
S450 Ocean Star41h
Bradner GMT40h
Water Resistance
S450 Ocean Star100m
Bradner GMT180m
MSRP
S450 Ocean Star$299
Bradner GMT$299

Full specifications

Case

6 specs
Category
Diver
GMT
Diameter
40mm
42mm
Thickness
12mm
15mm
Lug-to-Lug
48mm
50mm
Lug Width
20mm
22mm
Water Resistance
100m
180m

Crystal & Dial

2 specs
Dial Color
White
Brown
Lume
Tritium
None

Movement

5 specs
Caliber
TMI NH35A
Seiko NH34A
Beat Rate
21,600 vph
28,800 vph
Power Reserve
41h
40h
Jewels
24
25
Complications
GMT, Date
None

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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.

Spinnaker Bradner GMT

The Spinnaker Bradner GMT is praised for its awesome lume and comfortable wearability, with one owner noting the rubber strap is very comfortable and the beads of rice bracelet fits well on smaller wrists. Some find its 15mm thickness and bold colorway may not appeal to everyone, and one owner views it as more of a casual GMT with tool-watch styling than a diver. Overall, owners rate the Spinnaker Bradner GMT highly for its value and comfortable wearability.

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