Side by side

Oak & Oscar The Humboldt GMT SAR EditionvsSeiko Astron GPS Solar 2025 Limited Edition

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

The Humboldt GMT SAR Edition
Oak & OscarThe Humboldt GMT SAR Edition
MSRP $2,950
Astron GPS Solar 2025 Limited Edition
SeikoAstron GPS Solar 2025 Limited Edition
MSRP $2,600

At a glance

16 of 29 specs differ
Diameter
The Humboldt GMT SAR Edition39.5mm
Astron GPS Solar 2025 Limited Edition42mm
Power Reserve
The Humboldt GMT SAR Edition56 hoursh
Astron GPS Solar 2025 Limited Edition40h
Water Resistance
The Humboldt GMT SAR Edition200m
Astron GPS Solar 2025 Limited Edition100m
MSRP
The Humboldt GMT SAR Edition$2,950
Astron GPS Solar 2025 Limited Edition$2,600

Full specifications

Case

7 specs
Diameter
39.5mm
42mm
Thickness
12.5mm
12mm
Lug-to-Lug
46.8mm
47.9mm
Lug Width
20mm
14mm
Material
Grade 5 Titanium
Titanium
Water Resistance
200m
100m
Caseback
Solid screw-down
Solid

Crystal & Dial

3 specs
Crystal Shape
Double-domed
Flat
AR Coating
Underside
Super-clear coating
Lume
Super-LumiNova
LumiBrite on hands and index(es)

Movement

5 specs
Caliber
Sellita SW330
3X62
Type
Automatic
Quartz
Beat Rate
4 vph
28,800 vph
Power Reserve
56 hoursh
40h
Jewels
25
10

Pricing

1 specs
MSRP
$2,950
$2,600

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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.

Oak & Oscar The Humboldt GMT SAR Edition

Oak & Oscar The Humboldt GMT SAR Edition is praised for its anti-magnetic properties, sandwich lume dial, and overall construction quality for its price point. It features a brushed Grade 5 titanium case, a navy blue sandwich dial with an orange minute track and seconds hand, and a Sellita SW330 movement with a 56-hour power reserve. Minor drawbacks noted include bracelet sizing adjustment and lume brightness. On balance, owners and reviewers rate Oak & Oscar The Humboldt GMT SAR Edition highly for its robust construction and unique dial design at its price point.

Seiko Astron GPS Solar 2025 Limited Edition

The Seiko Astron GPS Solar 2025 Limited Edition is widely praised for its advanced GPS time and date adjustment capabilities, powered by light to eliminate battery changes. Owners and reviewers highlight its impressive accuracy and the convenience of automatic time zone updates, with some specifically commending the wearability of the 39mm size and its clean, simple design. However, reception of the GPS signal requires an unobstructed view of the sky, and manual time zone adjustments are necessary for Daylight Saving Time on some variants. One owner notes a slight imperfection in chapter ring alignment on the 39mm model. On balance, owners and reviewers rate the Seiko Astron GPS Solar 2025 Limited Edition highly for its satellite-powered timekeeping and improved wearability in the 39mm configuration.

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