Side by side

Bremont Altitude ChronographvsSeestern S450 Ocean Star

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

Altitude Chronograph
BremontAltitude Chronograph
MSRP $6,300
S450 Ocean Star
SeesternS450 Ocean Star
MSRP $299

At a glance

14 of 29 specs differ
Diameter
Altitude Chronograph42mm
S450 Ocean Star40mm
Power Reserve
Altitude Chronograph40h
S450 Ocean Star41h
Water Resistance
Altitude Chronograph100m
S450 Ocean Star100m
MSRP
Altitude Chronograph$6,300
S450 Ocean Star$299

Full specifications

Case

6 specs
Category
Chronograph
Diver
Diameter
42mm
40mm
Thickness
14.7mm
12mm
Lug-to-Lug
48mm
Lug Width
14.7mm
20mm
Material
316L Stainless Steel (DLC coated)
316L Stainless Steel

Crystal & Dial

2 specs
Dial Color
Silver
White
Lume
None
Tritium

Movement

5 specs
Caliber
BE-50AE
TMI NH35A
Beat Rate
28,800 vph
21,600 vph
Power Reserve
40h
41h
Jewels
25
24
Complications
None
GMT, Date

Pricing

1 specs
MSRP
$6,300
$299

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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.

Bremont Altitude Chronograph

Owners note faint marks on the case sides and back, with minor wear and creasing on the strap. Reviewers flag the "DANGER EJECTION SEAT" wordmark on the dial as a divisive design choice that disrupts the MB series' usual stark tone, though they praise the improved smoothness and click precision of the Roto Click rotating bezel. On balance, the Bremont Altitude Chronograph elicits mixed reactions, with design elements like the dial text being a point of contention for 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.

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