Side by side

Fortis Marinemaster M-40vsHalios Seaforth IV

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

Marinemaster M-40
FortisMarinemaster M-40
MSRP $3,520
Seaforth IV
HaliosSeaforth IV
MSRP $765

At a glance

11 of 29 specs differ
Diameter
Marinemaster M-4040mm
Seaforth IV40mm
Power Reserve
Marinemaster M-4038h
Seaforth IV40h
Water Resistance
Marinemaster M-40300m
Seaforth IV200m
MSRP
Marinemaster M-40$3,520
Seaforth IV$765

Full specifications

Case

5 specs
Thickness
13mm
12.4mm
Lug-to-Lug
46.5mm
Lug Width
21mm
20mm
Material
Stainless Steel
Titanium
Water Resistance
300m
200m

Crystal & Dial

2 specs
Crystal
Sapphire
Sapphire (double-domed)
Dial Color
Orange
Blue

Movement

3 specs
Caliber
Sellita SW220-1
Sellita SW200-2
Power Reserve
38h
40h
Jewels
26
25

Pricing

1 specs
MSRP
$3,520
$765

Follow this matchup

Get a note when Fortis Marinemaster M-40 vs Halios Seaforth IV gets more votes, a community discussion, or a price drop. No account needed.

What people say

Owners + reviewers, side by side

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Fortis Marinemaster M-40

Owners praise the Fortis Amber Orange for its gorgeous appearance and strong wrist presence, noting its crazy lume and 70-hour power reserve. The Doxa SUB 300T, described as having a superb, eccentric design with a highly legible dial and functional no-decompression bezel, uses an ETA 2824-2 movement. However, the SUB 300T's 42.5mm case wears large and its 14mm thickness is not ideal for dress shirts, though it boasts 1,200m water resistance. On balance, owners appreciate the Fortis Amber Orange for its striking aesthetics and impressive lume.

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.

Keep exploring

More watches worth a look

Matched to the watches above on size, movement, style and price — microbrands first. Open any one to dig in.

Adjacent matchups

People also compared

Comparisons nearby in the catalog — alternatives to the watches above paired against the matchup.