Side by side

Oak & Oscar The Humboldt GMTvsSeiko 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
Oak & OscarThe Humboldt GMT
MSRP $2,175
Astron GPS Solar 2025 Limited Edition
SeikoAstron GPS Solar 2025 Limited Edition
MSRP $2,600

At a glance

18 of 29 specs differ
Diameter
The Humboldt GMT39.5mm
Astron GPS Solar 2025 Limited Edition42mm
Power Reserve
The Humboldt GMT56 hoursh
Astron GPS Solar 2025 Limited Edition40h
Water Resistance
The Humboldt GMT200m
Astron GPS Solar 2025 Limited Edition100m
MSRP
The Humboldt GMT$2,175
Astron GPS Solar 2025 Limited Edition$2,600

Full specifications

Case

8 specs
Diameter
39.5mm
42mm
Thickness
12.5mm
12mm
Lug-to-Lug
46.8mm
47.9mm
Lug Width
20mm
14mm
Material
316L Stainless Steel
Titanium
Finish
Brushed
Brushed and polished
Water Resistance
200m
100m
Caseback
Solid screw-down
Solid

Crystal & Dial

4 specs
Crystal Shape
Double-domed
Flat
AR Coating
Underside
Super-clear coating
Dial Color
White
Black
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
$2,175
$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

Oak & Oscar The Humboldt GMT owners widely praise its exceptional accuracy, often running at or near 0 seconds per day, and its comfortable wearability with subtle design details. The construction quality for the price point, sandwich lume, and anti-magnetic properties are also highlighted. Some owners find the bracelet sizing adjustment slightly awkward, and one noted the lume could be brighter. Overall, owners rate the Oak & Oscar The Humboldt GMT highly for its accuracy and comfortable wearability.

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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