Side by side

Halios Seaforth IVvsLongines HYDROCONQUEST

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

Seaforth IV
HaliosSeaforth IV
MSRP $765
HYDROCONQUEST
LonginesHYDROCONQUEST
MSRP $2,000

At a glance

20 of 29 specs differ
Diameter
Seaforth IV40mm
HYDROCONQUEST41mm
Power Reserve
Seaforth IV40h
HYDROCONQUEST72h
Water Resistance
Seaforth IV200m
HYDROCONQUEST300m
MSRP
Seaforth IV$765
HYDROCONQUEST$2,000

Full specifications

Case

8 specs
Diameter
40mm
41mm
Thickness
12.4mm
11.9mm
Lug-to-Lug
46.5mm
53.5mm
Lug Width
20mm
21mm
Material
Titanium
Ceramic
Finish
Brushed and polished
Water Resistance
200m
300m
Caseback
Solid

Crystal & Dial

5 specs
Crystal
Sapphire (double-domed)
Sapphire
Crystal Shape
Flat
AR Coating
Inner
Dial Color
Blue
Green
Indices
Applied

Movement

6 specs
Caliber
Sellita SW200-2
L888.5
Beat Rate
28,800 vph
0 vph
Power Reserve
40h
72h
Jewels
25
0
Hacking
Yes
No
Hand-winding
Yes
No

Pricing

1 specs
MSRP
$765
$2,000

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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.

Longines HYDROCONQUEST

Owners widely praise the Longines Hydroconquest for its attractive sunburst blue dial and accurate timekeeping, with one owner reporting a loss of only 2 seconds per day. However, the bracelet is frequently criticized for lacking micro-adjustments and having pinch-prone links, and the screw-down crown is noted as inconvenient and difficult to operate by multiple owners. Some owners also flag the bezel action as ratchety with back play, and one owner found the lugs sharp and the overall design uncomfortable, leading them to sell the watch. On balance, owners appreciate the Longines Hydroconquest's aesthetic appeal and value, despite significant reservations about its bracelet and crown usability.

From video reviewers

The bezel action is praised for its smooth and precise rotation. Lume brightness is a shared weakness, found to be somewhat lacking. Reviewers disagreed on the watch's value proposition compared to alternatives.

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