Side by side

Bremont ionBirdvsSeiko Astron GPS Solar 2025 Limited Edition

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

ionBird
BremontionBird
MSRP $5,800
Astron GPS Solar 2025 Limited Edition
SeikoAstron GPS Solar 2025 Limited Edition
MSRP $2,600

At a glance

13 of 29 specs differ
Diameter
ionBird43mm
Astron GPS Solar 2025 Limited Edition42mm
Power Reserve
ionBird40h
Astron GPS Solar 2025 Limited Edition40h
Water Resistance
ionBird
Astron GPS Solar 2025 Limited Edition100m
MSRP
ionBird$5,800
Astron GPS Solar 2025 Limited Edition$2,600

Full specifications

Case

6 specs
Category
Pilot
GMT
Diameter
43mm
42mm
Thickness
12mm
Lug-to-Lug
47.9mm
Lug Width
14mm
Water Resistance
100m

Crystal & Dial

3 specs
AR Coating
Inner
Super-clear coating
Dial Color
Regular length (15cm - 19cm wrist size)
Black
Lume
None
LumiBrite on hands and index(es)

Movement

3 specs
Caliber
3X62
Type
Automatic
Quartz
Jewels
25
10

Pricing

1 specs
MSRP
$5,800
$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.

Bremont ionBird

Owners report the Bremont ionBird is overpriced and features a printed dial with a poorly placed date window at 4:30, which some find visually disruptive. However, some owners suggest its case finishing is superior to competitors. The 43mm titanium Bremont ionBird GMT is powered by a COSC-certified BE-93-2AV automatic movement and retails for $5,795. On balance, owners and reviewers find the Bremont ionBird's date window placement and price point to be significant drawbacks.

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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