Side by side

Halios Seaforth IVvsLongines FLAGSHIP HERITAGE MOONPHASE

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

Seaforth IV
HaliosSeaforth IV
MSRP $765
FLAGSHIP HERITAGE MOONPHASE
LonginesFLAGSHIP HERITAGE MOONPHASE
MSRP $3,450

At a glance

22 of 29 specs differ
Diameter
Seaforth IV40mm
FLAGSHIP HERITAGE MOONPHASE38.5mm
Power Reserve
Seaforth IV40h
FLAGSHIP HERITAGE MOONPHASE72h
Water Resistance
Seaforth IV200m
FLAGSHIP HERITAGE MOONPHASE30m
MSRP
Seaforth IV$765
FLAGSHIP HERITAGE MOONPHASE$3,450

Full specifications

Case

8 specs
Category
Diver
Moonphase
Diameter
40mm
38.5mm
Lug-to-Lug
46.5mm
46.3mm
Lug Width
20mm
19mm
Material
Titanium
Stainless Steel
Finish
Brushed and polished
Water Resistance
200m
30m
Caseback
Solid
Screw-down case back

Crystal & Dial

6 specs
Crystal
Sapphire (double-domed)
Sapphire
Crystal Shape
Flat
AR Coating
Inner
Both sides
Dial Color
Blue
Ivory
Indices
Applied
Applied indexes
Lume
None
Super-LumiNova

Movement

7 specs
Caliber
Sellita SW200-2
L899.5
Beat Rate
28,800 vph
25,200 vph
Power Reserve
40h
72h
Jewels
25
0
Hacking
Yes
No
Hand-winding
Yes
No
Complications
None
Hours, minutes, seconds, moon phase display and date indicated by small hand at

Pricing

1 specs
MSRP
$765
$3,450

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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 FLAGSHIP HERITAGE MOONPHASE

The Longines Flagship Heritage Moonphase is widely praised for its elegant aesthetic, balanced midnight blue dial with dauphine hands and wedge indices, and the L899.5 movement's 72-hour power reserve. Owners appreciate its value, classy integrated moonphase complication with a night blue background and shiny silver stars, and comfortable 38.5mm case size with good finishing, fitting well on smaller wrists. However, reviewers and owners note its minimal 30-meter water resistance, a 3 o'clock crown that appears undersized, and a thickness of 12.4mm, which some find hinders its dress watch suitability and ability to slip under a cuff, though others find it wearable. Some also consider the design overly traditional and the rehaut depth excessive. On balance, owners and reviewers rate the Longines Flagship Heritage Moonphase highly for its elegant design and value proposition at its price point.

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