Side by side

Seestern S450 Ocean StarvsLongines HYDROCONQUEST

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

S450 Ocean Star
SeesternS450 Ocean Star
MSRP $299
HYDROCONQUEST
LonginesHYDROCONQUEST
MSRP $2,350

At a glance

14 of 29 specs differ
Diameter
S450 Ocean Star40mm
HYDROCONQUEST39mm
Power Reserve
S450 Ocean Star41h
HYDROCONQUEST40h
Water Resistance
S450 Ocean Star100m
HYDROCONQUEST300m
MSRP
S450 Ocean Star$299
HYDROCONQUEST$2,350

Full specifications

Case

6 specs
Diameter
40mm
39mm
Thickness
12mm
12.2mm
Lug-to-Lug
48mm
48.1mm
Lug Width
20mm
19mm
Material
316L Stainless Steel
Stainless Steel
Water Resistance
100m
300m

Crystal & Dial

2 specs
Dial Color
White
Grey
Lume
Tritium
None

Movement

5 specs
Caliber
TMI NH35A
L888.5
Beat Rate
21,600 vph
28,800 vph
Power Reserve
41h
40h
Jewels
24
25
Complications
GMT, Date
None

Pricing

1 specs
MSRP
$299
$2,350

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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 HYDROCONQUEST

Owners widely praise the Longines HydroConquest's dial and finishing, with one owner finding it superior to a Rolex Submariner. The movement is noted as well-regulated, losing about 2 seconds per day. The watch is considered a versatile everyday or business-casual option, offering good value. However, owners criticize the bracelet for lacking tool-less micro-adjustment and describe winding the crown as a nuisance. Some in the line report tiny GMT markers that are difficult to read and the absence of a quick date adjust feature. Overall, owners rate the Longines HydroConquest highly for its finishing and value.

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