Side by side

Bremont Altitude Perpetual Calendar GMTvsHalios Seaforth IV

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

Altitude Perpetual Calendar GMT
BremontAltitude Perpetual Calendar GMT
MSRP $38,450
Seaforth IV
HaliosSeaforth IV
MSRP $765

At a glance

9 of 29 specs differ
Diameter
Altitude Perpetual Calendar GMT42mm
Seaforth IV40mm
Power Reserve
Altitude Perpetual Calendar GMT40h
Seaforth IV40h
Water Resistance
Altitude Perpetual Calendar GMT
Seaforth IV200m
MSRP
Altitude Perpetual Calendar GMT$38,450
Seaforth IV$765

Full specifications

Case

6 specs
Category
GMT
Diver
Diameter
42mm
40mm
Thickness
12.65mm
12.4mm
Lug-to-Lug
46.5mm
Lug Width
22mm
20mm
Water Resistance
200m

Crystal & Dial

1 specs
Crystal
Sapphire
Sapphire (double-domed)

Movement

1 specs
Caliber
Sellita SW200-2

Pricing

1 specs
MSRP
$38,450
$765

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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.

Bremont Altitude Perpetual Calendar GMT

The Bremont Altitude Perpetual Calendar GMT is a highly exclusive piece, with one owner noting its $44,000 price point raises questions about its target audience and suggesting it may be a limited production showpiece. Reviewers highlight its refined Trip-Tick case, now featuring softer curves, a 42mm diameter, and a 12.23mm thickness in grade 2 titanium, though the oversized crowns are flagged as a potential drawback. Overall, owners and reviewers acknowledge the Bremont Altitude Perpetual Calendar GMT as a distinctive, albeit niche, high-complication offering with a notable case refinement.

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.

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