Side by side

Zelos Hammerhead (Tantalum LE)vsSeestern S450 Ocean Star

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

Hammerhead (Tantalum LE)
ZelosHammerhead (Tantalum LE)
MSRP $1,499
S450 Ocean Star
SeesternS450 Ocean Star
MSRP $299

At a glance

15 of 29 specs differ
Diameter
Hammerhead (Tantalum LE)44mm
S450 Ocean Star40mm
Power Reserve
Hammerhead (Tantalum LE)40h
S450 Ocean Star41h
Water Resistance
Hammerhead (Tantalum LE)300m
S450 Ocean Star100m
MSRP
Hammerhead (Tantalum LE)$1,499
S450 Ocean Star$299

Full specifications

Case

6 specs
Diameter
44mm
40mm
Thickness
13mm
12mm
Lug-to-Lug
44mm
48mm
Lug Width
22mm
20mm
Material
Titanium
316L Stainless Steel
Water Resistance
300m
100m

Crystal & Dial

3 specs
Crystal
Domed Sapphire
Sapphire
Dial Color
Tantalum LE
White
Lume
None
Tritium

Movement

5 specs
Caliber
Seiko NH35
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
$1,499
$299

Follow this matchup

Get a note when Zelos Hammerhead (Tantalum LE) vs Seestern S450 Ocean Star gets more votes, a community discussion, or a price drop. No account needed.

What people say

Owners + reviewers, side by side

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

Zelos Hammerhead (Tantalum LE)

The Zelos Hammerhead (Tantalum LE) features a forged carbon dial and bezel insert with infused lume. On balance, owners and reviewers rate the Zelos Hammerhead (Tantalum LE) highly for its unique material composition and substantial feel.

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.

Keep exploring

More watches worth a look

Matched to the watches above on size, movement, style and price — microbrands first. Open any one to dig in.

Adjacent matchups

People also compared

Comparisons nearby in the catalog — alternatives to the watches above paired against the matchup.