Which is cheaper, the Halios Seaforth IV or the Formex Reef 42 mm?

At MSRP the Halios Seaforth IV is the cheaper of the two at $765, against $2,414 for the Formex Reef 42 mm — a $1,649 gap before any retailer discounting.

Which is bigger, the Halios Seaforth IV or the Formex Reef 42 mm?

The Formex Reef 42 mm wears larger at 42mm versus 40mm for the Halios Seaforth IV — a 2mm difference across the dial.

Which has better water resistance, the Halios Seaforth IV or the Formex Reef 42 mm?

The Formex Reef 42 mm is rated to 300m versus 200m for the Halios Seaforth IV.

Which has a longer power reserve, the Halios Seaforth IV or the Formex Reef 42 mm?

The Formex Reef 42 mm carries a 56-hour power reserve against 40 hours on the Halios Seaforth IV.

What movement does the Halios Seaforth IV run compared to the Formex Reef 42 mm?

Both watches run automatic movements — the Halios Seaforth IV uses the Sellita SW200-2 and the Formex Reef 42 mm uses the Sellita SW300-1.

Side by side

Halios Seaforth IVvsFormex Reef 42 mm

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

Halios Seaforth IV

seaforth-iv-gs-sunburst-blue

MSRP $765

Formex Reef 42 mm

reef-42mm-automatic-cosc-300m-black

MSRP $2,414

At a glance

12 of 29 specs differ

Diameter

Seaforth IV40mm

Reef 42 mm42mm

Power Reserve

Seaforth IV40h

Reef 42 mm56h

Water Resistance

Seaforth IV200m

Reef 42 mm300m

MSRP

Seaforth IV$765

Reef 42 mm$2,414

Full specifications

Case

6 specs

Diameter

40mm

42mm

Thickness

12.4mm

11.4mm

Lug-to-Lug

46.5mm

47mm

Lug Width

20mm

22mm

Material

Titanium

Stainless Steel

Water Resistance

200m

300m

Crystal & Dial

3 specs

Crystal

Sapphire (double-domed)

Sapphire

Dial Color

Blue

Black

Lume

None

Super-LumiNova

Movement

2 specs

Caliber

Sellita SW200-2

Sellita SW300-1

Power Reserve

40h

56h

Pricing

1 specs

MSRP

$765

$2,414

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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.

WatchUSeek·5

Formex Reef 42 mm

The Formex Reef 42 mm is widely praised for its comfortable bracelet featuring a micro-adjust clasp, COSC-certified Sellita movement, and excellent build quality. Owners appreciate the gradient dial's visual appeal and the overall wearability. Some owners note the seconds hand does not perfectly align with markers, and one owner found the lugs' taper hinders third-party strap fit. The bracelet's length and sporty design are noted as limiting versatility by some. On balance, owners and reviewers rate the Formex Reef 42 mm highly for its impressive wearability and value at the price point.

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