Side by side

Halios Seaforth IVvsZelos Hammerhead V3 300m Titanium

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

Seaforth IV
HaliosSeaforth IV
MSRP $765
Hammerhead V3 300m Titanium
ZelosHammerhead V3 300m Titanium
MSRP $559

At a glance

9 of 29 specs differ
Diameter
Seaforth IV40mm
Hammerhead V3 300m Titanium44mm
Power Reserve
Seaforth IV40h
Hammerhead V3 300m Titanium40h
Water Resistance
Seaforth IV200m
Hammerhead V3 300m Titanium300m
MSRP
Seaforth IV$765
Hammerhead V3 300m Titanium$559

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
Ti - Mosaic MOP

Movement

1 specs
Caliber
Sellita SW200-2
Seiko NH35

Pricing

1 specs
MSRP
$765
$559

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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 V3 300m Titanium

The Zelos Hammerhead V3 300m Titanium is widely praised for its exceptional lume, unique and beautiful dial finishing that reflects light dramatically, and solid build quality that exceeds its price point. Owners also highlight its comfortable wearability, especially the lightweight titanium variant, and the convenient on-the-fly micro-adjustment on the bracelet. One owner notes the Japanese movement performs better than anticipated, and the Ti-Damascus variant features a unique, patterned dial and bezel. However, some owners find the 44mm size large, the crown "off," and the bracelet clasp could be more scratch-resistant, with resizing pins described as stubborn. Reattaching the bracelet after removal is also noted as extremely difficult. Overall, owners rate the Zelos Hammerhead V3 300m Titanium highly for its impressive dial aesthetics and value for money.

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