Side by side

Halios Seaforth IVvsZelos Hammerhead (Tantalum LE)

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

Seaforth IV
HaliosSeaforth IV
MSRP $765
Hammerhead (Tantalum LE)
ZelosHammerhead (Tantalum LE)
MSRP $1,499

At a glance

9 of 29 specs differ
Diameter
Seaforth IV40mm
Hammerhead (Tantalum LE)44mm
Power Reserve
Seaforth IV40h
Hammerhead (Tantalum LE)40h
Water Resistance
Seaforth IV200m
Hammerhead (Tantalum LE)300m
MSRP
Seaforth IV$765
Hammerhead (Tantalum LE)$1,499

Full specifications

Case

5 specs
Diameter
40mm
44mm
Thickness
12.4mm
13mm
Lug-to-Lug
46.5mm
44mm
Lug Width
20mm
22mm
Water Resistance
200m
300m

Crystal & Dial

2 specs
Crystal
Sapphire (double-domed)
Domed Sapphire
Dial Color
Blue
Tantalum LE

Movement

1 specs
Caliber
Sellita SW200-2
Seiko NH35

Pricing

1 specs
MSRP
$765
$1,499

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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.

Halios Seaforth IV

Owners widely praise the Halios Sunburst Blue for its perfect 40mm size, stunning sunburst dial, and excellent lume, with one owner calling it Halios's best effort and a potential "Omega AT killer." The ETA 2824 movement is noted as running smoothly, and the watch is considered a great value with strong resale. Some owners desire larger sizes or different dial colors, and one reviewer found the Sinn 556i more versatile. The sapphire bezel is described as tall and flat, which is a point of contention for some. Overall, owners rate the Halios Sunburst Blue highly for its design, size, and value.

From video reviewers

The sunburst blue dial is a standout feature. Limited water resistance is a shared concern.

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.

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