Side by side

Halios Seaforth IVvsLongines MASTER COLLECTION MOONPHASE

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

Seaforth IV
HaliosSeaforth IV
MSRP $765
MASTER COLLECTION MOONPHASE
LonginesMASTER COLLECTION MOONPHASE
MSRP $3,500

At a glance

21 of 29 specs differ
Diameter
Seaforth IV40mm
MASTER COLLECTION MOONPHASE34mm
Power Reserve
Seaforth IV40h
MASTER COLLECTION MOONPHASE
Water Resistance
Seaforth IV200m
MASTER COLLECTION MOONPHASE30m
MSRP
Seaforth IV$765
MASTER COLLECTION MOONPHASE$3,500

Full specifications

Case

9 specs
Category
Diver
Moonphase
Diameter
40mm
34mm
Thickness
12.4mm
11.2mm
Lug-to-Lug
46.5mm
49.7mm
Lug Width
20mm
21mm
Material
Titanium
Stainless Steel
Finish
Brushed and polished
Water Resistance
200m
30m
Caseback
Solid

Crystal & Dial

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

Movement

6 specs
Caliber
Sellita SW200-2
L899.5
Beat Rate
28,800 vph
0 vph
Power Reserve
40h
0h
Jewels
25
0
Hacking
Yes
No
Hand-winding
Yes
No

Pricing

1 specs
MSRP
$765
$3,500

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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 MASTER COLLECTION MOONPHASE

Owners widely praise the Longines Master Collection Moonphase for its beautiful, legible, and mesmerizing dial, with one owner noting it balances class and complexity. The watch offers old-world charm and a romantic moonphase complication, with the Caliber L899 movement providing a 64-hour power reserve. Some owners find the $3k price point high, suggesting better value exists elsewhere, while others acquired it for around $1700 USD. One owner notes the 40mm size is a perfect fit for a 6.75-inch wrist, though its limited water resistance makes it unsuitable for adventurous wear. On balance, the consensus is that the Longines Master Collection Moonphase is highly regarded for its classic design and attractive moonphase complication at its price point.

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