Side by side

Bremont ionBirdvsSeiko Prospex SPEEDTIMER Seiko Brand 100th Anniversary SPEEDTIMER Limited Edition

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

ionBird
BremontionBird
MSRP $5,800

At a glance

15 of 29 specs differ
Diameter
ionBird43mm
Prospex SPEEDTIMER Seiko Brand 100th Anniversary SPEEDTIMER Limited Edition42mm
Power Reserve
ionBird40h
Prospex SPEEDTIMER Seiko Brand 100th Anniversary SPEEDTIMER Limited Edition40h
Water Resistance
ionBird
Prospex SPEEDTIMER Seiko Brand 100th Anniversary SPEEDTIMER Limited Edition100m
MSRP
ionBird$5,800
Prospex SPEEDTIMER Seiko Brand 100th Anniversary SPEEDTIMER Limited Edition$2,400

Full specifications

Case

7 specs
Category
Pilot
Chronograph
Diameter
43mm
42mm
Thickness
12.9mm
Lug-to-Lug
49.6mm
Lug Width
20mm
Material
Titanium
Stainless Steel
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
$2,400

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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 Prospex SPEEDTIMER Seiko Brand 100th Anniversary SPEEDTIMER Limited Edition

The Prospex SPEEDTIMER Seiko Brand 100th Anniversary SPEEDTIMER Limited Edition is praised for its retro design, balanced 42mm case, good finishing, and sapphire crystal. It is powered by the calibre 8R48, featuring a column wheel and vertical clutch, and offers 100m water resistance. Some find its 45-hour power reserve short compared to modern alternatives, and the date window placement is a point of discussion. The solar-powered variant is noted for its compact proportions and character, though some desire thinner cases and improved bracelet micro-adjustment. Overall, owners and reviewers appreciate the SPEEDTIMER's vintage-inspired aesthetics and solid build, with critiques focusing on power reserve and minor functional details.

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