Side by side

Halios Seaforth IVvsYema Skin Diver CMM.20

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

Seaforth IV
HaliosSeaforth IV
MSRP $765
Skin Diver CMM.20
YemaSkin Diver CMM.20
MSRP $2,372

At a glance

8 of 29 specs differ
Diameter
Seaforth IV40mm
Skin Diver CMM.2039.5mm
Power Reserve
Seaforth IV40h
Skin Diver CMM.2040h
Water Resistance
Seaforth IV200m
Skin Diver CMM.20200m
MSRP
Seaforth IV$765
Skin Diver CMM.20$2,372

Full specifications

Case

4 specs
Diameter
40mm
39.5mm
Thickness
12.4mm
11.5mm
Lug-to-Lug
46.5mm
47mm
Material
Titanium
316L Stainless Steel

Crystal & Dial

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

Movement

1 specs
Caliber
Sellita SW200-2
Yema CMM.20

Pricing

1 specs
MSRP
$765
$2,372

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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.

Yema Skin Diver CMM.20

Owners and reviewers widely praise the Yema Skin Diver CMM.20 for its vintage aesthetic, 39mm-39.5mm case size, and the in-house CMM.20 micro-rotor movement. The watch features a textured cream dial, sharp applied indices, and a satisfyingly over-engineered push-to-turn bi-directional bezel. The fully brushed bracelet with toolless micro-adjust clasp is highlighted as a significant improvement, though some note its extended lug-to-lug may challenge smaller wrists. Accuracy figures range from -3/+7 seconds per day to erratic results between 0 and -10 seconds per day, with a 70-hour power reserve. Some owners express concerns about the brand's QC reputation and the micro-rotor movement's performance, while one reviewer noted questionable finishing on a prototype's hour hand and a rattly clasp. Overall, owners and reviewers rate the Yema Skin Diver CMM.20 highly for its vintage styling and improved bracelet at the price.

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