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 $2,900

At a glance

14 of 29 specs differ
Diameter
ionBird43mm
Astron GPS Solar 2025 Limited Edition43.4mm
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$2,900

Full specifications

Case

6 specs
Category
Pilot
Chronograph
Diameter
43mm
43.4mm
Thickness
13.4mm
Lug-to-Lug
49.5mm
Lug Width
14mm
Water Resistance
100m

Crystal & Dial

4 specs
Crystal Shape
Flat
Curved
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
5X83
Type
Automatic
Quartz
Jewels
25
14

Pricing

1 specs
MSRP
$5,800
$2,900

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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 lauded for its advanced satellite timekeeping and perpetual calendar functionality, offering global time and location updates via GPS signals. Owners appreciate its well-built titanium or steel case, often featuring a ceramic bezel, and the unique asymmetrical design inspired by the 1983 Seiko 7A28 6000. However, its substantial 47mm size and 16.5mm thickness are frequently noted as drawbacks, with some finding it wears large and is difficult to fit under shirt sleeves. The perpetual calendar is limited to displaying only the date, and GPS signal reception requires a clear view of the sky, posing challenges indoors. The watch is priced around $2,900 and is limited to 3,000 pieces. Overall, owners and reviewers value the Seiko Astron GPS Solar 2025 Limited Edition for its cutting-edge technology and distinctive design, despite its considerable dimensions.

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