Side by side

Seestern S450 Ocean StarvsTudor Black Bay One 31

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

S450 Ocean Star
SeesternS450 Ocean Star
MSRP $299
Black Bay One 31
TudorBlack Bay One 31
MSRP $4,600

At a glance

15 of 29 specs differ
Diameter
S450 Ocean Star40mm
Black Bay One 3131mm
Power Reserve
S450 Ocean Star41h
Black Bay One 3150h
Water Resistance
S450 Ocean Star100m
Black Bay One 31100m
MSRP
S450 Ocean Star$299
Black Bay One 31$4,600

Full specifications

Case

7 specs
Diameter
40mm
31mm
Thickness
12mm
9.5mm
Lug-to-Lug
48mm
46mm
Lug Width
20mm
17mm
Material
316L Stainless Steel
Stainless Steel
Finish
Brushed and polished
Polished + Satin
Caseback
Solid
Solid screw-down

Crystal & Dial

2 specs
Dial Color
White
Anthracite
Lume
Tritium
None

Movement

5 specs
Caliber
TMI NH35A
MT5201
Beat Rate
21,600 vph
28,800 vph
Power Reserve
41h
50h
Jewels
24
25
Complications
GMT, Date
None

Pricing

1 specs
MSRP
$299
$4,600

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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.

Tudor Black Bay One 31

Owners widely report the Tudor Black Bay One 31's polished case and bracelet scratch easily, though its wearability under gloves and robust movement are praised. Some desire more micro-adjustment options on the clasp, and a lack of contrast between the silver dial and hands is noted. The 31mm size may be a consideration for daily wear due to its 50-hour power reserve. On balance, owners and reviewers appreciate the Tudor Black Bay One 31 for its comfortable wearability and robust movement, despite concerns about case scratching and clasp adjustability.

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